Höyhenjärvi
69°10′08″N 29°16′45″E / 69.1689°N 29.2791°E
Fjørvatnet (Finnish: Höyhenjärvi, Russian: Хеюхенъярви) is a lake along the Norway-Russia border in the Pasvikdalen valley. It is in Sør-Varanger municipality, Norway and in Murmansk Oblast, Russia. It is the core part of the a joint Norwegian and Russian Pasvik Nature Reserve.
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