'''Zagreb''' ( , , , ) is the capital and largest city of Croatia. It is 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  above sea level. The estimated population of the city in 2018 was 804,507. The population of the Zagreb urban agglomeration is 1,153,255, approximately a quarter of the total population of Croatia.