It is in Amazons.

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

• Something for giant spider, beholder and slime — they live down there.

• 1-2 — the chests

The strongest 14 of 18 kinds whose nests reach this place.

There are 3 chests here under 3 quest numbers, so you can take them all.