Storsjön (, ) is a lake in Gävle Municipality and Sandviken Municipality in Gästrikland and is a part of Gavleån. Storsjön has an area of a , a greatest depth of , and is approximately above sea level. The lake is drained by Gavleån. Experimental fishing has proved that there are many different varieties of fish here, such as perch, bream, sea bream and ruffe.
An old saying says that the lake has "just as many islands as there are days in a year" which should not be interpreted literally, but simply means that they are too many to count (a more accurate figure would be around 150 islands). Storsjön is mostly around in depth.
Old sources claim that Storsjön previously went by the name of Odensjön. This could possibly be proven by a 17th-century map where Gavleån, that flows through Gävle, is called Odensjöströmmen (lit. "Stream of Odensjön"). Storsjön is connected to Gavleån, which is connected to the sea.
Fish By experimental fishing, these fishes have been caught: Perch Bream Sea bream Ruffe Pike Sander Cyprinidae Bleak Roach European smelt Crucian carp Rudd Vendace Tench Vimba vimba
Compounds related to the lake Sandvikens segelsällskap SSS (lit. "Sandviken Yacht Club") Föreningen Rädda Storsjön (lit. "Compound Save the Great Lake")
Beaches Water samples are taken at the following beaches in Storsjön: Hedåsbadet, Sandviken Strandbaden, Årsunda Sörtuttsbadet, Sandviken
Catchment areas Storsjön is a part of catchment area (671779-155196) which the Swedish Meteorological and Hydrological Institute calls Utloppet av Storsjön (lit. "The outlet of the Great Lake"). The median height is above sea level, and the area is . If all the 367 catchment areas are counted upstream the accumulated area would be a . The catchment area Gavleån flows into the sea. The catchment area mostly contains forest (36%). The catchment area has a of water surface, giving it a lake percentage of %. Settlements in the area contain the size of , or 7% of the catchment area.
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