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 above sea level. The estimated population of the city in 2018 is 810,003. The population of the Zagreb urban agglomeration is about 1.1 million, approximately a quarter of the total population of Croatia.
Zagreb is a city with a rich history dating from the Roman times to the present day. The oldest settlement located 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 town 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 (but separated from Zagreb 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. The city extends over 30 km east-west and around 20 km north-south.
The transport connections, concentration of industry, scientific, and research institutions and industrial tradition underlie its leading economic position in Croatia. Zagreb is the seat of the central government, administrative bodies, and almost all government ministries. Almost all of the largest Croatian companies, media, and scientific institutions have their headquarters in the city. Zagreb is the most important transport hub in Croatia where Central Europe, the Mediterranean and Southeast Europe meet, making the Zagreb area the centre of the road, rail and air networks of Croatia. It is a city known for its diverse economy, high quality of living, museums, sporting, and entertainment events. Its main branches of economy are high-tech industries and the service sector.