This page offers a guide on where to locate and how to complete the mystery, Old Man on the Edge, in Rygjafylke.
Throw the Crates of the Edge
You’ll be able to find the old man on the edge of a cliff directly north of Fannaraki Summit, the synchronization point. When you speak to Old Harek, he will ask you to throw the crates near his horse and cart over the edge of the cliff, so that they join him in the afterlife. To do this, you’ll need to press ‘E’ to pick up a crate, then walk to the edge of the cliff and throw it using the left mouse button. Once you’ve thrown all of the crates over the edge, speak the man. After a short cut scene, the Mystery will be completed and you’ll earn 1,200 EXP.