They are in the map.eu editor, listed under water or ponds or something along those lines.
They are tricky to make 'above ground' as you need to build a wall around them. Have a look at fallingbostel to see how I did it, there's a rock pool and a dam there so it's a good example.
They are tricky to make 'above ground' as you need to build a wall around them. Have a look at fallingbostel to see how I did it, there's a rock pool and a dam there so it's a good example.