Geography and Wildlife
The isthmus' terrain has been influenced dramatically by the Weichsel glaciation. Its highest point lies on the Lembolovo Heights moraine at about 205 m (670 ft). There are no mountains on the isthmus, but steep hills occur in some places.
The Vuoksi, largest river, runs southeastwards from Lake Saimaa of Finland to Lake Ladoga, dividing the isthmus into two uneven parts. Saimaa Canal opened in 1856 links Lake Saimaa to the Bay of Vyborg.
The Karelian Isthmus lies within the ecoregion of Scandinavian and Russian taiga. Geobotanically, it lies at the juncture of the Central European, Eastern European and Northern European floristic provinces of the Circumboreal Region of the Holarctic Kingdom.
The isthmus is mostly covered by coniferous forests formed by Scots pine (Pinus sylvestris) and Norway spruce (Picea abies), with numerous lakes (e.g. Lake Sukhodolskoye and Lake Glubokoye) as well as small grass low moors and Sphagnum peat bogs. Forests cover approximately 11.700 km of the isthmus, more than three-fourths of its total square. Swampy areas occupy on average 5.5 percent of the territory. In the large contiguous area along the shore of Lake Ladoga in Vsevolozhsky District, in the southeastern part of the isthmus, bogs occur much more frequently than in other parts. The same was once true of the lowland along the Neva River, which has been drained. The soil is predominantly podsol, which contains massive boulders, especially in the north and northwest, where large granite rocky outcrops occur.
Pine forests (with Pinus sylvestris) are the most widespread and occupy 51% of the forested area of the Karelian Isthmus, followed by spruce forests (with Picea abies, 29%) and birch forests (with Betula pendula and B. pubescens, 16%). Stands on more fertile soils and in more favorable locations are occasionally dominated by Norway maple, black alder, grey alder, common aspen, English oak, grey willow, dark-leaved willow, tea-leaved willow, small-leaved lime or European white elm. Common vegetation of various types of pine forests includes heather, crowberry, common juniper, eared willow, lingonberry, water horsetail, bracken, graminoids (i.e. grasses in the wider sense) Avenella flexuosa and Carex globularis, mosses Pleurozium schreberi, Sphagnum angustifolium and S. russowii, and lichens Cladonia spp. Prominent in various spruce forests are wood horsetail, common wood sorrel, bilberry, lingonberry, graminoids Avenella flexuosa, Calamagrostis arundinacea, Carex globularis, and mosses Polytrichum commune and Sphagnum girgensohnii. Prominent vegetation of various birch forests include meadowsweet, common wood sorrel, bilberry and graminoids Calamagrostis arundinacea and C. canescens.
1184 species of wild vascular plants are recorded in the isthmus. See also the List of the vascular plants of the Karelian Isthmus. Red squirrel, moose, red fox, mountain hare and boar (reintroduced) are typical inhabitants of the forests.
The climate of the isthmus is moderately continental, with 650–800 mm (25–32 in) average precipitation per year, long snowy winters lasting from November through mid-April and occasionally reaching about -40°C (-40 F), moderately cool summers and short frost-free period. Compared to other parts of the Leningrad Oblast, the winter here is usually milder due to the moderating influence of the Gulf of Finland, but longer.
The city of Vyborg and the town of Priozersk are situated on the northwestern part of the isthmus.
The Karelian Isthmus is a popular place for hiking, cycling, skiing (Korobitsyno and Kavgolovo), climbing (near Kuznechnoye), canoeing (Losevo), fishing for consumption (of carp bream, northern pike, roach, European perch, ruffe, burbot and others), mushroom hunting (for porcini, red-capped scaber stalk, birch bolete, velvet bolete, slippery Jack, golden chanterelle, Lactarius resimus, woolly milk-cap, ugly milk-cap, saffron milk-cap, Lactarius rufus, various Russulas and others), berry picking (of bilberry, raspberry, woodland strawberry, cowberry, cranberry, cloudberry, bog bilberry and stone bramble). It is a popular summer resort for Saint Petersburg citizens since the late 19th century, served by trains of Finlyandsky Rail Terminal. The isthmus, especially the land along Saint Petersburg–Vyborg and Saint Petersburg–Priozersk railroads, hosts numerous dachas.
A 20–35 km wide stretch of land in Vyborgsky District and Republic of Karelia to the west of the Vyborg–Hiitola railway, as well as the islands and shores of the Gulf of Vyborg, belongs to the strictly guarded zone of the border control, reaching the shore of Lake Ladoga at Hiitola. In 1993–2006 the zone was formally 5 km wide, although in fact it has always been much wider. Visiting it is forbidden without a permit issued by the FSB (by KGB during the time of the Soviet Union).
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