Rise of the Tomb Raider: Find your way to the Observatory, walkthrough Rise of the Tomb Raider guide, walkthrough
Find your way up the mountains to the Observatory | The Gathering, walkthrough
Last update: 07 July 2020
To reach the observatory, you need to pass through a fragment of the geothermal valley. Jump over to the other side of the rift and walk across the brook. There, you find a camp.
Several steps past the camp, you should meet Jonah again. After the cutscene, the man gets abducted.