Why this Russian coastal region escaped the ice ages to become a biological sanctuary
In short: Primorsky Krai, a mountainous territory bordering the Sea of Japan, holds a unique ecological secret. Unlike the rest of Siberia, this region remained free of ice cover during the ice ages. This geological anomaly preserved an extraordinary diversity of ancient plant and animal species, creating a rare, living evolutionary laboratory.
Located in the southeasternmost corner of Russia, Primorsky Krai is defined by the Sikhote-Alin mountain range and a humid continental climate. Because the territory avoided the massive ice sheets that blanketed much of Siberia, it became a refuge for ancient flora and fauna. Today, the region hosts over two thousand species of higher plants, including roughly 250 varieties of trees, bushes, and lianas. This botanical richness includes rare relics like the lotus and various ferns, alongside nearly 200 species currently listed as threatened on the IUCN Red List.
The region's fauna is equally remarkable, serving as a critical habitat for iconic species such as the Amur tiger, the Amur leopard, and the Ussuri black bear. The area’s complex geography—ranging from mountainous tundra to the forest-steppe of the Khanka Lowlands—supports a dense concentration of biodiversity. Of the 690 bird species found in the former USSR, 350 are present here. However, this ecological treasure is under constant pressure from poaching and the illegal wildlife trade, prompting intervention from organizations like the World Wildlife Fund and the Phoenix Fund.
Historically, the region has been a crossroads of empires and cultures. Once part of Outer Manchuria, it was ceded to the Russian Empire in 1860, permanently cutting off China's access to the Sea of Japan. The territory has since transformed from a frontier zone into a hub for the Russian Navy's Pacific Fleet and a center for scientific research. Despite its industrial development, including significant fishing and mining sectors, the landscape remains dominated by mountains and forests, which cover nearly 80% of the land. The ongoing struggle to balance this industrial output with the preservation of traditional lands—such as those sought by the Udege people along the Bikin River—highlights the tension between economic growth and the stewardship of a unique, ancient ecosystem.
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- Summary by Intellect · source: Primorsky Krai
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