In Assassin's Creed Valhalla you can find maps leading to treasures. Sometimes they are in the form of a puzzle, other times it is a drawing of the land where you will find a treasure. This page of our guide describes where you can find the treasure map in the Rygjafylke region.
1st stage - map
You will find the treasure map in the north-eastern part of the map. Right next to the Kjotve Fortress.
The map is located in a wooden cottage, on a table with many vegetables. You just have to jump inside through the window and you'll get directly to the said table.
Grab the map and look at it in your inventory. This way you can read the tips.
There are also many other raw materials in the house that may be of interest to you. Look around and get what you need, no one will get mad for it.