please, where and for what can i use this map:

Treasure Map

Uncharted Land Map -- thank you for help

On the games page, there's a link to the Treasure Maps. You can bring completed sets there. The Uncharted ones will grant you access to the Omen Islands and can only be completed once. The regular treasure maps will give you a reward when completed, but it's not much so it's probably more worth it to just sell the map pieces (unless you're going for the achievement or something).

oh, thank you for answering so kindly and helpful. yes, i like the archivement, and the maps are not so expensiv, so i think it will not kill me :).