A hot, humid Summer island with an extremely tall mountain on one side. The mountain is snow-capped and a mysterious blue crystal can be mined inside the mountain that somehow never goes above freezing temperatures. The majority of the rest of the island is a dense city, and they have found ways to use these crystals in their homes to keep cool.
The city is also home to an enormous variety of competing Noodle Carts, all fighting to claim sections of the island as their turf.
As for the mountain... nobody has ever climbed the whole mountain - no one has ever passed the cloud-line and returned.