This guidebook describes bouldering in the region of Østmarka, close to Oslo. In a total of 9 sectors you will find more than 1500 boulder problems for all levels. Every sector can be identified with a specific colour that helps you identifying the right information throughout the whole guidebook. On the first pages of the guidebook there’s plenty of general information on history, geology, rock quality and a short description of each sector. Rock type is predominantly gneiss, that can be brittle some places but most boulder problems have solid hand and footholds as loose flakes are usually properly cleaned off. Due to sharp stone, friction in the area is great.