It is in Mists.

• 1 — Mists, as the map itself names it
• 2 — the ground above the treasure

• Key 3702: a locked door bars the way, and that is the number of the key that opens it.
• Key 3703: a locked door bars the way, and that is the number of the key that opens it.
• Something for giant spider, dragon and orc leader — they live down there.

• 1 — the chest
• 2 — Isle of Mist Exit
• 3 — Isle of Mist Entrance (1)

The strongest 14 of 21 kinds whose nests reach this place.

One chest, one reward.