Geography thumb|right|View of the Eidsfjorden thumb|right|View of the Rutle area in northern Gulen (photo: Bjarne Thune) Gulen has an area of about including about 1500 small islands, islets, and skerries. The largest of the islands are Byrknesøyna, Hiserøyna, Mjømna, and Sandøyna. The mainland is characterized by small valleys and large mountains crossing the landscape. The lake Dingevatn is one of Norway's deepest lakes.
geography thumb|right|view of the eidsfjorden thumb|right|view of the rutle area in northern gulen (photo bjarne thune) gulen has an area of about including about 1500 small islands islets and skerries the largest of the islands are byrknesøyna hiserøyna mjømna and sandøyna the mainland is characterized by small valleys and large mountains crossing the landscape the lake dingevatn is one of norway's deepest lakes