It is in Desert, about 16 steps south-west of the spot the map marks with that name.

And 1 down from the surface once you are there.

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

• Key 3303: a locked door bars the way, and that is the number of the key that opens it.
• Key 4009: a locked door bars the way, and that is the number of the key that opens it.
• Key 4023: a locked door bars the way, and that is the number of the key that opens it.
• Key 4055: a locked door bars the way, and that is the number of the key that opens it.
• Something for demon skeleton, orc berserker and slime — they live down there.

The chest is 1 floor under the surface. Going down over it, this is what each floor uses:

1. Ground: down through stairs.

• 1 — the way in: stairs, ground
• → — the treasure lies this way

• 1 — the chest
• 2 — Desert Dungeon Exit
• 3 — a tile to step on
• 4 — a tile to step on
• 5 — a tile to step on
• 6 — Desert Dungeon Exit

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

One chest, one reward.