Zagreb is the capital and the largest city of Croatia. It is located in the northwest of the country, along the Sava river, at the southern slopes of the Medvednica mountain. Zagreb lies at an elevation of approximately 122 m (400 ft) above sea level. The estimated population of the city in 2018 is 809,932. The population of Zagreb urban agglomeration is slightly above 1.1 million inhabitants and it makes approximately a quarter of a total population of Croatia.