Cimmeria is a beginner world that is accessible to unregistered players. It is a smaller circular world with a diameter of 4000 blocks. There is no Nether or End - you will need to look for these in other worlds!
This world is often used as a trading station, as most players do not build a permanent house on Cimmeria and are usually at the spawn point.
Cimmeria was originally created as a starter world in 1.10, welcoming new faces that haven't registered yet. Due to an ongoing issue of chunks corruption, it was reset around 1.13's release. A second reset happened for 1.19 in order to clear a lot of subpar buildings.
Cimmeria is also the only survival world at the Creeper's Lab to reset periodically. As needed, not more than once every few months, all of Cimmeria outside the spawn area is completely reset. This lets new players more easily find new locations to explore, while established ones can find fresh resources to bring back home.
The safe area, kept between resets, is marked on the map and in-game by orange and white markers.
Aditus
Church of Chielosofie
Stone Empire