Dredged Land

 is an empty tile created by removing soil or sand tiles with a Crude Dredger. These empty tiles can then be filled in by pouring 3 units of Soil or Sand with a bucket (the last one added will determine the new terrain type).

Water tiles will automatically expand into adjacent dredged land, so in order to create new water tiles at a desired location, a continuous channel must be dredged there from an existing body of water.