Mars

A fairly cold and somewhat arid planet.

Mars, named after the Roman god of war, is named quite aptly, for its people are giant scorpions who are always at war with one another. And many horrible creatures inhabit its deserts, savannahs, and swamps.

Inhabitants
Mars has a complete ecosystem. However, it is dominated by sentient scorpions called Martians.

Martians
Martians are giant scorpions.

The Western Hemisphere is dominated by the Spanish-speaking kingdom of Victoria, while the Eastern Hemisphere is dominated by the Russian-speaking Union of Boyars.

Non-sentient lifeforms
There are giant dune worms and sarlaccs in the deserts. There are countless of 'subscorpions' which look like the Martians but are far from sentient. There are hundreds of trillions of ants, many of them gigantic. There are 'fish' with hairy backs that drudge through swamps.