In total, there are thousands of images called the
Tanum petroglyphs, on about 600 panels within the World Heritage Area. These are concentrated in distinct areas along a 25 km stretch, and covers an area of about 51 hectares (126 acres or 0.5 km2). While the region was on the coastline when the drawings were made, it is now at an elevation of 25 m.
Scandinavian Bronze Age and
Iron Age people were sophisticated craftsmen and very competent travelers by water. (Dates for ages vary with the region; in Scandinavia, the Bronze Age is roughly 1800 to 500 BC.) Many of the glyphs depict boats of which some seem to be of the
Hjortspring boat type carrying around a dozen passengers. Wagons or carts are also depicted. Other glyphs depict humans with a bow, spear or axe, and others depict hunting scenes. In all cases the pictures show people performing rituals. There is a human at a plough drawn by two oxen, holding what might be a branch or an ox-goading crop made of a number of strips of hide. One of the larger rocks of
Nordic Bronze Age petroglyphs in Scandinavia (at 22 metres tall and 6 metres wide), the
Vitlyckehäll, is located in Tanumshede. It contains nearly 300 carvings of a variety of scenes, people, and objects. Some have been painted red to make them more visible for tourists; a practice which has drawn criticism for removing the authenticity and original state of the drawings. == Recent history ==