Maps are what you play on, including all the biomes, mini biomes, and terrain. You can create your own maps in deeeep.io mapmaker. The current maps are:
Free For All: nac_ffa
Team FFA: new_ffa_morty
Pearl Defens: Tacoco_pd
v1: v1_official
1v1: rocky_cove_1v1
Toxic Algae: -------
:D