Mariupol (UK: /ˌmæriˈuːpɒl/, US: /ˌmɑːriˈuːpəl/; Ukrainian: Маріу́поль [mɐr⁽ʲ⁾iˈupolʲ]) is a city on the north coast of the Sea of Azov at the mouth of the Kalmius River, in the Pryazovia region of Ukraine. Prior to the 2022 Russian invasion of Ukraine and its capture by Russia, it was the tenth-largest city in Ukraine and the second-largest in Donetsk Oblast, with an estimated population of 425 681, according to a January 2022 estimate. Following its capture, the population is now, according to Ukrainian authorities, estimated to be less than 100,000.