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 122 m 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.
Zagreb is a city with a rich history dating from Roman times. The oldest settlement in the vicinity of the city was the Roman Andautonia, in today's Ščitarjevo. The name "Zagreb" is recorded in 1134, in reference to the foundation of the settlement at Kaptol in 1094. Zagreb became a free royal city in 1242. In 1851 Zagreb had its first mayor, Janko Kamauf.
Zagreb has special status as a Croatian administrative division and is a consolidated city-county, and is administratively subdivided into 17 city districts. Most of them are at a low elevation along the river Sava valley, whereas northern and northeastern city districts, such as Podsljeme and Sesvete districts are situated in the foothills of the Medvednica mountain, making the city's geographical image rather diverse.