Mostar is a city and the administrative center of Herzegovina-Neretva Canton of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. Inhabited by 105,797 people, it is the most important city in the Herzegovina region, serving as its cultural and economic capital. Mostar is situated on the Neretva River and is the fifth-largest city in the country. Mostar was named after the bridge keepers (mostari) who in the medieval times guarded the Stari Most (Old Bridge) over the Neretva. The Old Bridge, built by the Ottomans in the 16th century, is one of Bosnia and Herzegovina’s most visited landmarks, and is considered an exemplary piece of Islamic architecture in the Balkans.