Without spoiling too much, there is a side mission in which you need to get some Beaver furs. The clue given is just ‘rivers up north’ but it does not tell you exactly where.
So while hunting for some other wildlife in the game yesterday, I chanced upon some beavers so I would like to share its location.
In all, I came across two locations; one near Nekoti Rock and another Aurora Basin. Both are located in between Cochinay and Tall Trees. While I first located them at Nekoti Rock, I spent a long time locating three. I decided to trace down the path which led me to Aurora Basin, and it was easier to track them by the river.