Água

Water is broken down by deep and shallow tiles,

Deep tiles can't be walked on, and are darker blue in color.

Shallow tiles can be walked on and are lighter in color.

To change a deep tile into a shallow tile you need to use a shovel. using a shovel on shallow tiles can yield clay.

You can also change normal land tiles into water with a shovel and vice versa. To change water tile back into a land tile you need to make make sure there are no deep water tiles adjacent to it.