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.