The lake Leshevoe - general information


Fig. 1 - Valamo Island
  • Valamo Island is situated at the North-West of the Ladoga Lake (Fig.1). There are 11 lakes at the island, among them two are semi-closed (connected with the Ladoga by narrow streams). The lake Leshevoe - the subject of the present study (Fig. 2)- is the second in the total size among them.
  • The lake Leshevoe (Fig. 2) is connected with the Ladoga from the one side and with another semi-closed lake - Sisjarve from another. However, the water exchange is not sufficient. During the hot summer seasons the streams, connecting lakes, are nearly dried-up, making them actually closed.



  • Valamo Archipelago and the Lake Leshevoe at Valamo Island (in blue)

  • The Lake consists of three "gulfs". It has average depth about 2m, however in one site, near rocky coast, the depths reaches 14m. Total area of the lake is 0.164 km2. Water conditions are generally oligosaprobic (Marinich et al., 1998), they moves to the beta-mesosaprobic in summer season. Water pH 7.2-7.4 (Kyrapceva et. al., 1992). Coastal line of the lake shows diverse types of ecotopes - sandy beaches, marches, rocky coasts. Bottom of the lake is covered with the sick (0.5 - 2.1m) layer of soft sediments, which are transformed into the sapropel in the most deep part (our data).
    The lake Leshevoe.View from the "Point 2" monitoring site to the Western part of the lake. Photo September, 1999
    The lake Leshevoe.View from the "Point 2" monitoring site to the Eastern part of the lake. Photo September, 1999
    The lake Leshevoe.View from the Eastern coast to the Western part of the lake. Swampy coast of the lake. Photo September, 1999
    The lake Leshevoe.View from the "Point 4" monitoring site to the North-Western coast of the lake. Rocky coast of the lake. Photo September, 1999
    The lake Leshevoe.View from the "Point 2" monitoring site to the Western coast of the lake. Typical litoral zone. Photo September, 1999