Sandimirov S.S. Catalogue of lakes in the Russian, Finnish and Norwegian Border Area. Finland, Jyvaskyla: Kopijyva Oy, 2008.

NORWEGIAN LAKES 2.1. LAKE BIGGEJAVRE Lake Biggejavre (watershed of River Kautokejnoelva) is located 283 km to the west of the town of Nikel. The oval­ shaped lake is not large (area of the lake 5.2 km2) or deep (maximum depth 16 m), and is of glacial origin. The maxi­ mum length is 5.2 km and maximum width 1.5 km. The points of maximum depth are located in the central part of the lake. According to the landscape type, the watershed area belongs to the forest- tundra zone, with heights ofupto 600 m. The lake shores are high and stony, with shrubs and birch woodland. The water of the lake is colourless. 2.1.1. Hydrochemistry The pH of the water in the lake is close to neutral, and the water has a low total mineralization (average 23.9 mg/l) and alkalinity (average 256 peq/1). The lake has low concentrations of base cations and anions, with calcium (average 3.84 mg/l) and bicarbonate (average 15.7 mg/l) predominating. Increased concentrations of P and N are important criteria when estimating water eutrophication. The concentra­ tions of and relationship between species of P and N vary according to the season, and the dynamics is to a greater extent determined by the level of production and, consequently, the trophicity of the water body. The average concentrations of total P and total N during the veg­ etation period are 6 pg/l and 120 pg/l, respectively. According to the concentrations of mineral nutrients, the lake is classified as oligotrophic. The colour values, and organic matter (4.9 mg/l) and Fe con­ centrations (average 82 pg/l) are typical for lakes in the region. Physico-geographical characteristics Watershed River Kautokejnoelva— River Altaelva Latitude 69°16.264' Longitude 23°25.685' Height above sea level, m 383.0 Maximum length, km 5.2 Maximum width, km 1.5 Maximum depth, m 16 Area, km 2 5.2 Watershed area, km 2 120.0 Study period 2005 Hydrochemical properties pH 6.83 6.72-6.95 Electrical conductivity, 32 mS/cm 31-34 Ca, mg/l 3.84 3.65-4.04 Mg, mg/l 0.88 0.86-0.90 Na, mg/l 1.10 1.08-1.13 K, mg/l 0.56 0.54-0.58 HC03, mg/l 15.7 13.9-17.5 S04, mg/l 1.23 1.21-1.25 Cl, mg/l 0.66 0 . 66 - 0.66 Total mineralization, mg/l 23.9 21.9-26.0 Alkalinity, neq/l 256 227-286 Water colour, deg. 26 25-27 NH4, цд/І 6 3-9 N03, цд/І 13 1-26 Total N, |_ig/l 119 118-120 P04, цд/І 1 1-1 Total P, цд/І 6 5-6 Fe, pg/l 82 64-101 Catalogue of Lakes in the Russian, Finnish and Norwegian BorderArea