The Ukraine consists mainly of plains which are flanked by the foothills of the Carpathians to the west, and the Black Sea and the Sea of Azov to the south. The latter are separated by the Crimea, which is a partly mountainous virtual island, connected to the mainland by a low-lying narrow isthmus. The country is drained by the Dnieper and Donets Rivers, with associated lakes and tributaries, flowing south into the Black Sea. It is known for its rich soils and agricultural lands and also has substantial iron and coal deposits, supporting a large iron and steel industry. The country has a population of nearly 46 million.