# Dellen

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**Dellen** is a lake system in the [province](/source/Provinces_of_Sweden) of [Hälsingland](/source/H%C3%A4lsingland), Sweden. It consists of two lakes, *Northern Dellen* and *Southern Dellen*, appreciated among [fly-fishermen](/source/Fly_fishing) for their population of [brown trout](/source/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 separated by a short channel, and it is therefore disputed whether they should be counted as one or two lakes. The two lakes together have a total area of 130 km2, which would be the 18th largest [Swedish lake](/source/Lakes_of_Sweden).

The vaguely circular lake system was formed by an [impact crater](/source/Impact_crater) 89 million years ago, placing the impact in the [Late Cretaceous](/source/Late_Cretaceous). The resulting impact crater measures about 19 kilometers in diameter. It has resulted in the area containing the rock [Dellenite](/source/Dellenite) (a rock intermediate in composition between [Rhyolite](/source/Rhyolite) and [Dacite](/source/Dacite)),[1] which has become the provincial rock.[2]

[Asteroid](/source/Asteroid) [7704 Dellen](/source/7704_Dellen) was named after it.

An installation of the [Sweden Solar System](/source/Sweden_Solar_System) representing [Pluto](/source/Pluto) and [Charon](/source/Charon_(moon)) lies near the southern lake; the pillars holding the model objects are made of dellenite.

## References

1. Le Maître, R.W. (2002). [*Igneous rocks: a classification and glossary of terms : recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks*](https://books.google.com/books?id=t9fzBKbmRUEC&q=%2Bdellenite&pg=PA72). 2 ed. [Cambridge University Press](/source/Cambridge_University_Press). p. 72. ISBN 978-0-521-66215-4. Retrieved 27 October 2010.

1. Retrieved 2016-02-28.

## External links

- [Dellen Information and map](https://web.archive.org/web/20060503215131/http://www.dellenbygden.nu/dellenbygden.htm) Dellenbygden.nu; in Swedish only

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Adapted from the Wikipedia article [Dellen](https://en.wikipedia.org/wiki/Dellen) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Dellen?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.