The Republic of Poland (Rzeczpospolita Polska) is one of the largest countries in Central Europe, bordering Russia, Lithuania, Belarus, Ukraine, Slovakia, the Czechia (Czech Republic) and Germany. The country lies almost entirely on the North European Plain and is a land of gentle relief, rarely rising above 350 feet except along the southern border with the Sudety and Carpathian mountain ranges. Rysy is the highest mountain peak, 8200 feet above sea level. The longest rivers which cross the country north-ward are the Vistula (667 miles in length) in the centre, and the Odra (530 miles) which flows along Poland's western border.