Dellen

{{short description|Lake system in Hälsingland, Sweden}}

{{Infobox lake

| name = Dellen

| image = Skålsvedja, Hudiksvalls kommun.jpg

| caption =

| alt = View of lake

| image_size = 250

| pushpin_map = Sweden Gävleborg # Sweden

| pushpin_map_alt = Location of Dellen lake

| image_bathymetry = Dellen.png

| caption_bathymetry = Map of the area

| alt_bathymetry = Map showing location of the lakes within the area

| location = Hälsingland

| coords = {{coord|61|51|N|16|42|E|region:SE-X_type:waterbody|display=inline,title}}

| type =

| inflow =

| outflow =

| catchment =

| basin_countries= Sweden

| length =

| width =

| area = {{convert|52|km²|abbr=on}} (Southern Dellen),
{{convert|82|km²|abbr=on}} (Northern Dellen)

| depth =

| max-depth =

| volume = {{convert|1,226|e6m³|acre.ft|abbr=out}} (Southern),
{{convert|1,489|e6m³|acre.ft|abbr=out}} (Northern)

| residence_time =

| shore =

| elevation = {{convert|42|m|abbr=on}}

| islands =

| cities =

}}

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 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 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.

The vaguely circular lake system was formed by an impact crater 89 million years ago, placing the impact in the Late Cretaceous. The resulting impact crater measures about 19 kilometers in diameter. It has resulted in the area containing the rock Dellenite (a rock intermediate in composition between Rhyolite and Dacite),{{cite book|last=Le Maître|first=R.W.|title=Igneous rocks: a classification and glossary of terms : recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks|url=https://books.google.com/books?id=t9fzBKbmRUEC&q=%2Bdellenite&pg=PA72|accessdate=27 October 2010|edition=2|year=2002|publisher=Cambridge University Press|isbn=978-0-521-66215-4|page=72}} which has become the provincial rock.{{cite Earth Impact DB | name = Dellen| accessdate = 2016-02-28}}

Asteroid 7704 Dellen was named after it.

An installation of the Sweden Solar System representing Pluto and Charon lies near the southern lake; the pillars holding the model objects are made of dellenite.