From Dungeon Defenders 2 Wiki
Dungeon Defenders II is set in the fictional world of Etheria, specifically within the Kingdom of Dragonfall. Starting from The Private Tavern or in The Heroes Marketplace - the outdoor HUB, players will be able to head into various locations broken down into playable maps to explore and defend by accessing the Wartable.
What does a map contain
Each map is an arena with set enemy spawners and objectives to defend.
The High Seas
The Wild West
These maps are available only in very specific gamemodes unlike most common maps.