My last two items in Geothermal Valley are two survival caches. I suspect that I missed one of those maps/backpacks that reveals their locations because everything else is marked as found in the Region Summary.
The last survival caches in Geothermal Valley
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Best Answer
You likely missed caches near the Infirmary base camp & tomb (north part of the map) so fast travel there. Go to the puzzle area and swim to the right, where you can dive underwater and enter another area with a cache and a backpack (satchel) that will reveal any others in the area.