Piasek is an earth-sized planet with equal gravity, but only two different environments – desert and polar. It also has oceans, so the environment is its only drastic difference from earth. Piasek orbits its star from roughly the same distance as Earth does the sun.
As said earlier, Piasek only has one large desert continent, called Ziarna, and one large polar continent, called Lumi. Both hold diverse wildlife. They are separated by a relatively small ocean, which is more like a channel.
I addition to these, the Salsenes have colonized this world. They currently have only one town on the planet.