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Location Hälsingland
Coordinates 61°51′N 16°42′E / 61.850°N 16.700°E / 61.850; 16.700Coordinates: 61°51′N 16°42′E / 61.850°N 16.700°E / 61.850; 16.700
Basin countries Sweden
Surface area 52 km² (Southern Dellen), 82 km² (Northern Dellen)
Water volume 1,226 million m³ (Southern), 1,489 million m³ (Northern)
Surface elevation 42 m

Dellen is a lake system in the province of Hälsingland, Sweden. It consists of two lakes, Northern Dellen and Southern Dellen, appreciated among fly-fishermen for their distinct population of brown trout.

Southern Dellen has a surface area of 52 km² and a water volume of 1,226 million m³. Northern Dellen has an area of 82 km² and a water volume of 1,489 million m³.

The two lakes are only united by a short channel, and it is therefore disputed whether they should be counted as one or two lakes. If counted together, it would have a total area of 130 km², making it the 18th largest Swedish lake.

The vaguely circular lake system was formed by an impact crater 140 million years ago, placing the impact in the Early Cretaceous. The resulting impact crater measures about 19 kilometres in diameter. It has resulted in the area containing the rock Dellenite (a rock intermediate in composition between Rhyolite and Dacite),[1] which has become the provincial rock.[2]

Asteroid 7704 Dellen was named after it.


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