Mostar is a city and municipality in Bosnia and Herzegovina, the largest and one of the most important cities in the Herzegovina region and the center of the Herzegovina-Neretva Canton of the Federation. Mostar is situated on the Neretva river and is the fifth-largest city in the country. Mostar was named after the bridge keepers (natively: mostari) who in the medieval times guarded the Stari Most (Old Bridge) over Neretva river. The Old Bridge is one of the city's most recognizable landmarks.