diff --git a/regression/regression/main.nut b/regression/regression/main.nut
index ffb0856dd6..f32c708614 100644
--- a/regression/regression/main.nut
+++ b/regression/regression/main.nut
@@ -547,6 +547,8 @@ function Regression::Prices()
 	print("  BT_DOCK:  " + AIMarine.GetBuildCost(AIMarine.BT_DOCK));
 	print("  BT_DEPOT: " + AIMarine.GetBuildCost(AIMarine.BT_DEPOT));
 	print("  BT_BUOY:  " + AIMarine.GetBuildCost(AIMarine.BT_BUOY));
+	print("  BT_LOCK:  " + AIMarine.GetBuildCost(AIMarine.BT_LOCK));
+	print("  BT_CANAL: " + AIMarine.GetBuildCost(AIMarine.BT_CANAL));
 	print(" -Tile-");
 	print("  BT_FOUNDATION:   " + AITile.GetBuildCost(AITile.BT_FOUNDATION));
 	print("  BT_TERRAFORM:    " + AITile.GetBuildCost(AITile.BT_TERRAFORM));
@@ -556,6 +558,7 @@ function Regression::Prices()
 	print("  BT_CLEAR_ROCKY:  " + AITile.GetBuildCost(AITile.BT_CLEAR_ROCKY));
 	print("  BT_CLEAR_FIELDS: " + AITile.GetBuildCost(AITile.BT_CLEAR_FIELDS));
 	print("  BT_CLEAR_HOUSE:  " + AITile.GetBuildCost(AITile.BT_CLEAR_HOUSE));
+	print("  BT_CLEAR_WATER:  " + AITile.GetBuildCost(AITile.BT_CLEAR_WATER));
 }
 
 function cost_callback(old_path, new_tile, new_direction, self) { if (old_path == null) return 0; return old_path.GetCost() + 1; }
@@ -919,6 +922,9 @@ function Regression::Marine()
 
 	print("  BuildWaterDepot():    " + AIMarine.BuildWaterDepot(28479, 28480));
 	print("  BuildDock():          " + AIMarine.BuildDock(29253, AIStation.STATION_JOIN_ADJACENT));
+	print("  BuildBuoy():          " + AIMarine.BuildBuoy(28481));
+	print("  BuildLock():          " + AIMarine.BuildLock(28487));
+	print("  BuildCanal():         " + AIMarine.BuildCanal(28744));
 }
 
 function Regression::Order()
@@ -1470,9 +1476,41 @@ function Regression::TileList()
 		print("    " + i + " => " + list.GetValue(i));
 	}
 
-	list.AddRectangle(54421 - 256 * 2, 256 * 2 + 54421 + 8);
+	list.AddRectangle(0x6F3F, 0x7248);
 	list.Valuate(AITile.IsWaterTile);
-	print("  Water():             done");
+	print("  IsWaterTile():       done");
+	print("  Count():             " + list.Count());
+	print("  ListDump:");
+	for (local i = list.Begin(); !list.IsEnd(); i = list.Next()) {
+		print("    " + i + " => " + list.GetValue(i));
+	}
+
+	list.Valuate(AITile.IsSeaTile);
+	print("  IsSeaTile():         done");
+	print("  Count():             " + list.Count());
+	print("  ListDump:");
+	for (local i = list.Begin(); !list.IsEnd(); i = list.Next()) {
+		print("    " + i + " => " + list.GetValue(i));
+	}
+
+	list.Valuate(AITile.IsRiverTile);
+	print("  IsRiverTile()        done");
+	print("  Count():             " + list.Count());
+	print("  ListDump:");
+	for (local i = list.Begin(); !list.IsEnd(); i = list.Next()) {
+		print("    " + i + " => " + list.GetValue(i));
+	}
+
+	list.Valuate(AIMarine.IsCanalTile);
+	print("  IsCanalTile()        done");
+	print("  Count():             " + list.Count());
+	print("  ListDump:");
+	for (local i = list.Begin(); !list.IsEnd(); i = list.Next()) {
+		print("    " + i + " => " + list.GetValue(i));
+	}
+
+	list.Valuate(AITile.IsCoastTile);
+	print("  IsCoastTile()        done");
 	print("  Count():             " + list.Count());
 	print("  ListDump:");
 	for (local i = list.Begin(); !list.IsEnd(); i = list.Next()) {
diff --git a/regression/regression/result.txt b/regression/regression/result.txt
index f2d42cc86f..69322b1d2d 100644
--- a/regression/regression/result.txt
+++ b/regression/regression/result.txt
@@ -7365,6 +7365,9 @@ ERROR: IsEnd() is invalid as Begin() is never called
   GetBankBalance():     1999959285
   BuildWaterDepot():    true
   BuildDock():          true
+  BuildBuoy():          true
+  BuildLock():          true
+  BuildCanal():         true
 
 --Prices--
  -Rail-
@@ -7391,6 +7394,8 @@ ERROR: IsEnd() is invalid as Begin() is never called
   BT_DOCK:  262
   BT_DEPOT: 525
   BT_BUOY:  262
+  BT_LOCK:  5625
+  BT_CANAL: 3750
  -Tile-
   BT_FOUNDATION:   187
   BT_TERRAFORM:    187
@@ -7400,6 +7405,7 @@ ERROR: IsEnd() is invalid as Begin() is never called
   BT_CLEAR_ROCKY:  150
   BT_CLEAR_FIELDS: 375
   BT_CLEAR_HOUSE:  1200
+  BT_CLEAR_WATER:  7500
 
 --Rail--
     IsRailTile():                  false
@@ -8450,54 +8456,221 @@ ERROR: IsEnd() is invalid as Begin() is never called
   KeepValue(1):        done
   Count():             0
   ListDump:
-  Water():             done
-  Count():             45
+  IsWaterTile():       done
+  Count():             40
+  ListDump:
+    29251 => 1
+    29250 => 1
+    29249 => 1
+    29248 => 1
+    29247 => 1
+    28996 => 1
+    28995 => 1
+    28994 => 1
+    28993 => 1
+    28992 => 1
+    28991 => 1
+    28744 => 1
+    28741 => 1
+    28740 => 1
+    28739 => 1
+    28738 => 1
+    28737 => 1
+    28736 => 1
+    28735 => 1
+    28488 => 1
+    28487 => 1
+    28486 => 1
+    28485 => 1
+    28484 => 1
+    28483 => 1
+    28482 => 1
+    28480 => 1
+    28479 => 1
+    29256 => 0
+    29255 => 0
+    29254 => 0
+    29253 => 0
+    29252 => 0
+    29000 => 0
+    28999 => 0
+    28998 => 0
+    28997 => 0
+    28743 => 0
+    28742 => 0
+    28481 => 0
+  IsSeaTile():         done
+  Count():             40
+  ListDump:
+    29251 => 1
+    29250 => 1
+    29249 => 1
+    29248 => 1
+    29247 => 1
+    28996 => 1
+    28995 => 1
+    28994 => 1
+    28993 => 1
+    28992 => 1
+    28991 => 1
+    28741 => 1
+    28740 => 1
+    28739 => 1
+    28738 => 1
+    28737 => 1
+    28736 => 1
+    28735 => 1
+    28485 => 1
+    28484 => 1
+    28483 => 1
+    28482 => 1
+    29256 => 0
+    29255 => 0
+    29254 => 0
+    29253 => 0
+    29252 => 0
+    29000 => 0
+    28999 => 0
+    28998 => 0
+    28997 => 0
+    28744 => 0
+    28743 => 0
+    28742 => 0
+    28488 => 0
+    28487 => 0
+    28486 => 0
+    28481 => 0
+    28480 => 0
+    28479 => 0
+  IsRiverTile()        done
+  Count():             40
   ListDump:
-    54941 => 1
-    54940 => 1
-    54939 => 1
-    54938 => 1
-    54937 => 1
-    54936 => 1
-    54935 => 1
-    54934 => 1
-    54933 => 1
-    54685 => 1
-    54684 => 1
-    54683 => 1
-    54682 => 1
-    54681 => 1
-    54680 => 1
-    54679 => 1
-    54678 => 1
-    54677 => 1
-    54429 => 1
-    54428 => 1
-    54427 => 1
-    54426 => 1
-    54425 => 1
-    54424 => 1
-    54423 => 1
-    54422 => 1
-    54421 => 1
-    54173 => 1
-    54172 => 1
-    54171 => 1
-    54170 => 1
-    54169 => 1
-    54168 => 0
-    54167 => 0
-    54166 => 0
-    54165 => 0
-    53917 => 0
-    53916 => 0
-    53915 => 0
-    53914 => 0
-    53913 => 0
-    53912 => 0
-    53911 => 0
-    53910 => 0
-    53909 => 0
+    29256 => 0
+    29255 => 0
+    29254 => 0
+    29253 => 0
+    29252 => 0
+    29251 => 0
+    29250 => 0
+    29249 => 0
+    29248 => 0
+    29247 => 0
+    29000 => 0
+    28999 => 0
+    28998 => 0
+    28997 => 0
+    28996 => 0
+    28995 => 0
+    28994 => 0
+    28993 => 0
+    28992 => 0
+    28991 => 0
+    28744 => 0
+    28743 => 0
+    28742 => 0
+    28741 => 0
+    28740 => 0
+    28739 => 0
+    28738 => 0
+    28737 => 0
+    28736 => 0
+    28735 => 0
+    28488 => 0
+    28487 => 0
+    28486 => 0
+    28485 => 0
+    28484 => 0
+    28483 => 0
+    28482 => 0
+    28481 => 0
+    28480 => 0
+    28479 => 0
+  IsCanalTile()        done
+  Count():             40
+  ListDump:
+    28744 => 1
+    29256 => 0
+    29255 => 0
+    29254 => 0
+    29253 => 0
+    29252 => 0
+    29251 => 0
+    29250 => 0
+    29249 => 0
+    29248 => 0
+    29247 => 0
+    29000 => 0
+    28999 => 0
+    28998 => 0
+    28997 => 0
+    28996 => 0
+    28995 => 0
+    28994 => 0
+    28993 => 0
+    28992 => 0
+    28991 => 0
+    28743 => 0
+    28742 => 0
+    28741 => 0
+    28740 => 0
+    28739 => 0
+    28738 => 0
+    28737 => 0
+    28736 => 0
+    28735 => 0
+    28488 => 0
+    28487 => 0
+    28486 => 0
+    28485 => 0
+    28484 => 0
+    28483 => 0
+    28482 => 0
+    28481 => 0
+    28480 => 0
+    28479 => 0
+  IsCoastTile()        done
+  Count():             40
+  ListDump:
+    28998 => 1
+    28997 => 1
+    28743 => 1
+    28742 => 1
+    29256 => 0
+    29255 => 0
+    29254 => 0
+    29253 => 0
+    29252 => 0
+    29251 => 0
+    29250 => 0
+    29249 => 0
+    29248 => 0
+    29247 => 0
+    29000 => 0
+    28999 => 0
+    28996 => 0
+    28995 => 0
+    28994 => 0
+    28993 => 0
+    28992 => 0
+    28991 => 0
+    28744 => 0
+    28741 => 0
+    28740 => 0
+    28739 => 0
+    28738 => 0
+    28737 => 0
+    28736 => 0
+    28735 => 0
+    28488 => 0
+    28487 => 0
+    28486 => 0
+    28485 => 0
+    28484 => 0
+    28483 => 0
+    28482 => 0
+    28481 => 0
+    28480 => 0
+    28479 => 0
 
 --TileList_IndustryAccepting--
   Count():             47
@@ -9099,12 +9272,12 @@ ERROR: IsEnd() is invalid as Begin() is never called
     GetLocation():       33417
     GetEngineType():     153
     GetUnitNumber():     1
-    GetAge():            0
+    GetAge():            1
     GetMaxAge():         5490
-    GetAgeLeft():        5490
+    GetAgeLeft():        5489
     GetCurrentSpeed():   7
     GetRunningCost():    421
-    GetProfitThisYear(): 0
+    GetProfitThisYear(): -1
     GetProfitLastYear(): 0
     GetCurrentValue():   5947
     GetVehicleType():    1
@@ -9114,7 +9287,7 @@ ERROR: IsEnd() is invalid as Begin() is never called
     IsInDepot():         false
     GetNumWagons():      1
     GetWagonEngineType(): 153
-    GetWagonAge():       0
+    GetWagonAge():       1
     GetLength():         8
   GetOwner():           1
   BuildVehicle():       14
@@ -9139,9 +9312,9 @@ ERROR: IsEnd() is invalid as Begin() is never called
   GetNumWagons():       3
   GetLength():          24
   GetWagonEngineType(): 9
-  GetWagonAge():        1
+  GetWagonAge():        0
   GetWagonEngineType(): 27
-  GetWagonAge():        1
+  GetWagonAge():        0
   GetWagonEngineType(): 27
   GetWagonAge():        0
   GetWagonEngineType(): 65535
@@ -9187,11 +9360,11 @@ ERROR: IsEnd() is invalid as Begin() is never called
     14 => 1
     12 => 1
   Age ListDump:
-    17 => 1
-    16 => 1
-    14 => 1
     13 => 1
     12 => 1
+    17 => 0
+    16 => 0
+    14 => 0
   MaxAge ListDump:
     16 => 10980
     14 => 10980
@@ -9199,9 +9372,9 @@ ERROR: IsEnd() is invalid as Begin() is never called
     13 => 5490
     12 => 5490
   AgeLeft ListDump:
-    16 => 10979
-    14 => 10979
-    17 => 7319
+    16 => 10980
+    14 => 10980
+    17 => 7320
     13 => 5489
     12 => 5489
   CurrentSpeed ListDump:
diff --git a/src/script/api/ai_changelog.hpp b/src/script/api/ai_changelog.hpp
index e5699a7d47..f977168e49 100644
--- a/src/script/api/ai_changelog.hpp
+++ b/src/script/api/ai_changelog.hpp
@@ -21,6 +21,11 @@
  * \li AINewGRF
  * \li AINewGRFList
  * \li AIGroup::GetNumVehicles
+ * \li AIMarine::BT_LOCK
+ * \li AIMarine::BT_CANAL
+ * \li AITile::IsSeaTile
+ * \li AITile::IsRiverTile
+ * \li AITile::BT_CLEAR_WATER
  *
  * \b 1.11.0
  *
diff --git a/src/script/api/game_changelog.hpp b/src/script/api/game_changelog.hpp
index d3efea9197..8eab8956ed 100644
--- a/src/script/api/game_changelog.hpp
+++ b/src/script/api/game_changelog.hpp
@@ -20,6 +20,11 @@
  * API additions:
  * \li GSNewGRF
  * \li GSNewGRFList
+ * \li GSMarine::BT_LOCK
+ * \li GSMarine::BT_CANAL
+ * \li GSTile::IsSeaTile
+ * \li GSTile::IsRiverTile
+ * \li GSTile::BT_CLEAR_WATER
  *
  * \b 1.11.0
  *
diff --git a/src/script/api/script_marine.cpp b/src/script/api/script_marine.cpp
index c63add8faa..16f0228dbe 100644
--- a/src/script/api/script_marine.cpp
+++ b/src/script/api/script_marine.cpp
@@ -167,6 +167,8 @@
 		case BT_DOCK:  return ::GetPrice(PR_BUILD_STATION_DOCK, 1, nullptr);
 		case BT_DEPOT: return ::GetPrice(PR_BUILD_DEPOT_SHIP, 1, nullptr);
 		case BT_BUOY:  return ::GetPrice(PR_BUILD_WAYPOINT_BUOY, 1, nullptr);
+		case BT_LOCK:  return ::GetPrice(PR_BUILD_LOCK, 1, nullptr);
+		case BT_CANAL: return ::GetPrice(PR_BUILD_CANAL, 1, nullptr);
 		default: return -1;
 	}
 }
diff --git a/src/script/api/script_marine.hpp b/src/script/api/script_marine.hpp
index 324ed8f3e9..b3ba022105 100644
--- a/src/script/api/script_marine.hpp
+++ b/src/script/api/script_marine.hpp
@@ -36,6 +36,8 @@ public:
 		BT_DOCK,  ///< Build a dock
 		BT_DEPOT, ///< Build a ship depot
 		BT_BUOY,  ///< Build a buoy
+		BT_LOCK,  ///< Build a lock
+		BT_CANAL, ///< Build a canal
 	};
 
 	/**
diff --git a/src/script/api/script_tile.cpp b/src/script/api/script_tile.cpp
index 360b32c025..90411a7f76 100644
--- a/src/script/api/script_tile.cpp
+++ b/src/script/api/script_tile.cpp
@@ -58,6 +58,20 @@
 	return true;
 }
 
+/* static */ bool ScriptTile::IsSeaTile(TileIndex tile)
+{
+	if (!::IsValidTile(tile)) return false;
+
+	return ::IsTileType(tile, MP_WATER) && ::IsSea(tile);
+}
+
+/* static */ bool ScriptTile::IsRiverTile(TileIndex tile)
+{
+	if (!::IsValidTile(tile)) return false;
+
+	return ::IsTileType(tile, MP_WATER) && ::IsRiver(tile);
+}
+
 /* static */ bool ScriptTile::IsWaterTile(TileIndex tile)
 {
 	if (!::IsValidTile(tile)) return false;
@@ -320,6 +334,7 @@
 		case BT_CLEAR_ROCKY:  return ::GetPrice(PR_CLEAR_ROCKS, 1, nullptr);
 		case BT_CLEAR_FIELDS: return ::GetPrice(PR_CLEAR_FIELDS, 1, nullptr);
 		case BT_CLEAR_HOUSE:  return ::GetPrice(PR_CLEAR_HOUSE, 1, nullptr);
+		case BT_CLEAR_WATER:  return ::GetPrice(PR_CLEAR_WATER, 1, nullptr);
 		default: return -1;
 	}
 }
diff --git a/src/script/api/script_tile.hpp b/src/script/api/script_tile.hpp
index 423044b21a..4ee12c6912 100644
--- a/src/script/api/script_tile.hpp
+++ b/src/script/api/script_tile.hpp
@@ -119,6 +119,7 @@ public:
 		BT_CLEAR_ROCKY,  ///< Clear a tile with rocks
 		BT_CLEAR_FIELDS, ///< Clear a tile with farm fields
 		BT_CLEAR_HOUSE,  ///< Clear a tile with a house
+		BT_CLEAR_WATER,  ///< Clear a tile with either river or sea
 	};
 
 	/**
@@ -158,11 +159,28 @@ public:
 	 */
 	static bool IsBuildableRectangle(TileIndex tile, uint width, uint height);
 
+	/**
+	 * Checks whether the given tile is actually a sea tile.
+	 * @param tile The tile to check on.
+	 * @pre ScriptMap::IsValidTile(tile).
+	 * @return True if and only if the tile is a sea tile.
+	 */
+	static bool IsSeaTile(TileIndex tile);
+
+	/**
+	 * Checks whether the given tile is actually a river tile.
+	 * @param tile The tile to check on.
+	 * @pre ScriptMap::IsValidTile(tile).
+	 * @return True if and only if the tile is a river tile.
+	 */
+	static bool IsRiverTile(TileIndex tile);
+
 	/**
 	 * Checks whether the given tile is actually a water tile.
 	 * @param tile The tile to check on.
 	 * @pre ScriptMap::IsValidTile(tile).
 	 * @return True if and only if the tile is a water tile.
+	 * @note Returns false when a buoy is on the tile.
 	 */
 	static bool IsWaterTile(TileIndex tile);