Omiš, Croatia: Pirate Stronghold at the Cetina River, Fortresses & Adventure Tourism
The City of Omiš, located in Split-Dalmatia County, spans 266.2 km² and is home to 14,139 inhabitants according to the 2021 census, comprising thirty-one settlements at the mouth of the Cetina River where it meets the Adriatic Sea. It borders the City of Split and several municipalities along the coast and inland regions.
The ancient name Oneum (or Onaeum) is recorded up until the 7th century, while Roman artifacts have been discovered in the hamlet of Baučići – including inscriptions of the emperors Tiberius and Claudius, a portrait of Tiberius, and an altar dedicated to Augustus – all of which point to the municipal significance of the settlement.
The Middle Ages brought the Kačić princes and pirate activity directed against the Venetian Republic and papal ships, which in turn led to crusades in 1221 and Venetian campaigns in 1286–1287. The pirates employed shallow-draft vessels known as “Omiš arrows” (Omiške strijele) and an underwater wall called the “Mostina” at the river mouth, which controlled the passage of ships by means of a chain barrier.
The fortresses of Mirabela and Starigrad overlooked the river mouth and the Brač Channel, while Gomilica, situated on the left bank, lies in ruins today. Following the sale of Dalmatia to the Venetian Republic in 1409, Omiš entered its Venetian period, which lasted until 1797.
In more recent times, the town’s politics and economy have included riverside industry and the development of tourism, which capitalizes on the Cetina Canyon and adrenaline-fueled activities alongside the cultural heritage of the old town.