Kungsholmen is an
island in
Lake Mälaren in
Sweden, part of
Stockholm City. It is situated north of
Riddarfjärden and considered part of the historical province
Uppland. Its area is 3.9 km² with a perimeter of 8.9 km. The highest point is at Stadshagsplan (47 m). The total population is 56,754 (December 31, 2007).