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

Table 3. The organic matter contents (LOI, %) and heavy metal concentrations (цд/д, dry weight) in the surface (О-1cm) and pre-industrial (15-16 cm) sediment layers. Cfand Cdare contamination factor and degree of contamination values, respectively. Lake Layer, cm LOI Cu Ni Zn Co Cd Pb As Hg cd Keudsherjaur 0-1 27.53 45 65 50 8.7 0.22 12.9 3.36 0.072 15-16 27.91 8 15 93 3.9 0.03 1.4 1.16 0.009 c, 5.8 4.3 0.5 2.2 8.2 9.4 2.9 8.0 41.5 Fig. 3. Vertical distribution of the concentrations of Ni, Cu, Pb, Cd and Hg (цд/д, dry weight) in the sediment core ofLake Keudsherjaur. 1.3.3. Hydrobiological studies No direct hydrobiological investigations have been carried out in this lake. 1.4. LAKE KIRIKOVANJARVI Lake Kirikovanjarvi (watershed of the River Pechenga) is located 4 km to the south of the settlement of Pechenga. It is a small (area of the lake 0.36 km2), shallow-water (maximum depth 8 m) elongated oval lake of glacial origin. The maximum length is 01.2 km, and maximum width 0.4 km. The point ofmaximum depth (8 m) is located in the central part of the lake. In the eastern and western parts of the lake the maximum depths are small, up to only 4 m. According to the landscape type, the watershed area represents a combina­ tion of flat, low-lying areas of glaciola- custrine flatlands, and tectonic massifs with a height of upto 180.8 m. The lake shores are high and covered by birch and pine forests. The water of the lake is col­ ourless. Boulder beds occur in almost all parts of the littoral zone. The gaps be­ tween the boulders are filled with sand and pebbles. Physico-geographical characteristics Watershed River Pechenga Latitude 69°30.358' Longitude 31°13.916' Height above sea level, m 78.6 Maximum length, km 1.2 Maximum width, km 0.4 Maximum depth, m 8 Area, m2 0.36 Watershed area, km2 3.2 Study period 2004 20 Catalogue of Lakes in the Russian, Finnish and Norwegian BorderArea