Suifenhe (Chinese: 绥芬河) is a county-level city in southeastern Heilongjiang province, People’s Republic of China, located where the former Chinese Eastern Railway crosses the border with Russia’s town of Pogranichny, Primorsky Krai. In January 2014 Suifenhe became the only Chinese city in which trading with Russian Ruble is allowed. The city shares its name with the Suifen River, and is under the administration of Mudanjiang Prefecture-level City.