Geothermal Valley - Climbing Down from the Cliffside Overlook

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From the Cliffside Lookout Base Camp, where you re-entered the valley from The Acropolis and found a strongbox (6/8) with a HEAVY PISTOL PART (3/4)....

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...grapple-swing over to the zip line and slide down to the ledge below, on the east side of the canyon.

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Turn around and climb into the wooden shelter above.

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Here you'll find a box of supplies and a document (19/33), On the Threat of Wolves from the Ways of the Valley series.

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Climb down and use a grenade arrow to destroy the metal barrier on the wooden shack.

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Inside is another strongbox (7/8). This one contains a BREAK-ACTION SHOTGUN PIECE (3/4).

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Go up the steps beside the shack to a small, grassy ledge with a hardwood sapling, 3 salvage crates, and another document (20/33), Summer from the Pages of the Ledger series (Greek). There's also a survival cache (15/20) buried near the rock wall. (It will be marked on your map if you found Explorer Satchel #4 near the Aqueduct Ruins Base Camp.)

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Climb the tree in front of the shack and jump over to the roof of the shack.

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From there you can jump and grapple the rock ledge above the survival cache. Pull up to find a box of supplies.

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Leap back over to the shack roof and from there to the tree branch, then the treehouse on the right.

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Here you'll find an Archivist Map (7/9) that reveals the locations of numerous documents and relics in the area ahead. Slide down the zip line into the swamp below.

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