It is in Rookgaard, about 124 steps west of the spot the map marks with that name.

And 5 down from the surface once you are there.

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

• A rope. You drop in through a hole, and a rope is how you climb back out.
• Something for minotaur, rotworm and orc spearman — they live down there.

The chest is 5 floors under the surface. Going down over it, this is what each floor uses:

1. Ground: down through a ladder.
2. 1 down: down through a hole.
3. 2 down: down through a hole.
4. 3 down: down through a hole.
5. 4 down: down through stairs.

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

• 2 — a hole, 1 down
• → — the treasure lies this way

• 3 — a hole, 2 down
• → — the treasure lies this way

• 4 — a hole, 3 down
• → — the treasure lies this way

• 5 — stairs, 4 down
• → — the treasure lies this way

• 1 — the chest
• 2 — the chest

There are 2 chests here under 2 quest numbers, so you can take them all.