Total area of Pasvik Nature Reserve covers 36300 acres (147 km²) 
 -  water bodies — 21%, 
   -  forests — 52%, 
   -  marshes — 25%, 
   -  other — 2%.
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The reserve's territory is a narrow land, stretching for 44 km along the Russian-Norwegian border. Pasvik is the only nature reserve in Russia, whose area is entirely situated in the border zone. The reserve's western boundary completely coincides with the Norwegian state border.