Omiš is a town and port in the Dalmatia region of Croatia, and is a municipality in the Split-Dalmatia County. The town is situated approximately 25km south-east of Croatia's second largest city, Split. Its location is where the Cetina River meets the Adriatic Sea. Omiš municipality has a population of 14,936 and its area is 266km².NameIt is supposed that the name of this city, Omiš, developed from the Slavic Holm, Hum as a translation from the Illyrian - Greek word Onaion, Oneon, meaning "hill" or "place on the hill", but there is also the possibility that the name of the settlement Onaeum was derived from the name of the river which was called Nestos by the Greek colonists in its lower flow, during Antiquity. According to Petar Šimunović, Omiš is derived from Proto-Indo-European *almissa ("rock", "cliff").Latin names during Ancient Rome were Onaeum, Oeneum, Alminium, and Almissum. During Medieval times the name was recorded as Olmissium, Almiyssium and from the end of the 15th century, when the city fell to the authority of Venetian Republic, its name was the Italian Almissa.HistoryOmiš was well known in the past by the Corsairs of Almissa whose Sagittas , brought fame to them because they were built for attack and fast retrieval into the mouth of the Cetina River, protecting the town from foreign invaders. At a very early date, neighbours of the Corsairs of Almissa, the highlanders of the Poljica Principality, became their friends and allies. This allowed them to harass the seaborne trade, without fear of a sudden attack from inland.