Create a lake or a beach front on your planet. As of server 3.0400 generates a small amount of food (algae), ore (whatever kind a mine on the planet produces), and water.

A complete set of beach tiles is given to anyone who sends out invitations and gets 10 or more people to sign up.

Even if you don't particularly want a set of these tiles, they are a useful trade commodity.

This tile can be constructed at the Archaeology Ministry using two gypsum glyphs.