|Surface area||9.47 km2 (3.66 sq mi)|
|Water volume||18.6 million cubic metres (15,100 acre⋅ft)|
|Surface elevation||870 m (2,850 ft)|
Helin has an area of 9,47 km² and its circumference is 27.17 km. It is located at 870 m above the sea, and has a volume of 18.6 million m³. In 1930 a 35 km² area between Helin and the Syndin lakes to the east was recognized as a botanical plant national park.
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