Katnosa

LocationNordmarka (Lunner, Jevnaker and Ringerike)

Coordinates60°09′N 10°35′E / 60.150°N 10.583°E / 60.150; 10.583

Primary outflowsKatnoselva

BasincountriesNorway

Katnosa
Katnosa
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Location	Nordmarka (Lunner, Jevnaker and Ringerike)
Coordinates	60°09′N 10°35′E / 60.150°N 10.583°E / 60.150; 10.583
Primary outflows	Katnoselva
Basin countries	Norway
Surface area	2.2 km2 (0.85 sq mi)
Surface elevation	464 m (1,522 ft)

Katnosa is a regulated lake in Nordmarka, Norway bordering to the municipalities Lunner, Jevnaker and Ringerike. It drains through the river Katnoselva to the lakes Store Sandungen, Hakkloa, Bjørnsjøen and Skjærsjøen. It is regulated by the dam Katnosdammen from 1886. Katnosa is part of the Spålen–Katnosa Nature Reserve.^[1]