Moving upstream into Mongolia, we leave behind the woodland wilderness of China's extreme north and Siberia's south to follow the Amur's two westernmost tributaries across the planet's vastest wild grasslands.
The Amur's coastal delta is one of the richest eco-systems on earth. Nourished by the mighty river's enormous sediment load, the Sea of Okhotsk is a hotspot of biodiversity with arctic and subtropical species living side by side.
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