Laduviken

Laduviken () is a lake in Norra Djurgården, a semi-rural area in north-eastern Stockholm, Sweden, forming part of the Royal National City Park. It is one of six lakes in Djurgården, the others being: Lillsjön, Uggleviken, Isbladskärret, Lappkärret, and Spegeldammen.

== Catchment area == thumb|left|Historical map showing the area in the 17th century. Most of the catchment area is composed of open grassland with scattered oaks and other hardwood. West of the lake, the buildings of the Stockholm University take up some 20 per cent of the surface and a few roads, a traffic route, the suburban railway Roslagsbanan, and the subterranean metro passes through the area. East of the lake are some minor one-family houses and commercial buildings. The terrain north of the lake is flat while the southern shore is steep and, as the area west of the lake is drained by a ditch dug through a filled-up wetland, most of the catchment area is located there and most of the inflow comes from an ooze and oil separator treating water from human-made structures. A tiny river guides the outflow east to the bay Husarviken which is part of the strait Lilla Värtan. In the late 1970s, the lake was deepened by dredging to prevent it from becoming choked-up during the 21st century, and a system of canals was then created in the western end of the lake. As part of a national park, the lake is considered as of great recreational value.