This map was created by Inuit people in Greenland as a practical navigation aid, describing the shape of the coastline for Danish explorers. There are essentially no trees in Greenland, so driftwood was a very valuable material used for a variety of practical and artistic purposes. To save space, the map runs up one edge and down the other edge of the piece.
It can be very difficult to analyze some maps, particularly if they take an unusual form.
Unknown Inuit, Carved wooden coastal charts carried in their kayaks by Greenland Inuit (Eskimo) (n.d.) Courtesy of the Greenland National Museum & Archives.