for first, this is the spawn point of the world, where is a bonus chest that has some items that will help you to survive.

And, like i've said on the description, this map will generate only the "frozen ocean" biome, so, all that you can find is like that.

Just with a few exception where you can find grass and sand generated naturally, like that.

For finishing, this map has the achievements enabled, so, you can win achievements on this map.