This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Oslofjord Baatstoe. Map of inner Oslofjord with the small hamlet of Btst in different colour Derivative of map by Finn Bjrklid own assumed Ekko Maps of Buskerud
Page 2023 Free-images.com. All images are Public Domain