Omiš is a city and port in the Dalmatia region of Croatia, and is a municipality in the Split-Dalmatia County. The city is situated approximately 25 km (16 miles) south-east of Croatia's second largest city, Split. Its location is where the emerald-green Cetina River meets the Adriatic Sea (Croatian: Jadransko More). Omiš has a population of 15,800 and its area is 266 km2 (103 m2).
Historic names of the city have included: Oneum (Onaeum), Onaion (Oneon), Holm (Hum), Olmisi, Olmissium, Almivssium and Almissa (Ancient greek).
Within the limits of the city lie the following settlements: Blato na Cetini, Borak, Čelina, Čisla, Donji Dolac, Dubrava, Gata, Gornji Dolac, Kostanje, Kučiće, Lokva Rogoznica, Marušići, Mimice, Naklice, Nova Sela, Omiš, Ostrvica, Pisak, Ruskamen, Podašpilje, Podgrađe, Putišići, Seoca, Slime, Smolonje, Srijane, Stanići, Svinišće, Trnbusi, Tugare, Zakučac and Zvečanje.
Today, Omiš's economy is based on farming, fishing, textile and food-processing industries and tourism.
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Omiš was well known in the past by the Corsairs of Almissa (Omiški gusari) whose Sagittas (ships) (Genitive case: Sagittae, translated as The Arrow), 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  (Poljička Republika), became their friends and allies. This allowed them to harass the seaborne trade, without fear of a sudden attack from inland.
* Historical monuments:
o Church of St Euphemia by the coast on Brzet, from the early 6th century
o Mirabella Fortress (Peovica) from the 13th century
o Starigrad Fortress (Fortica) from the 15th century
o Renaissance church of the Holy Spirit from the 15th century
o Old cemetery, the 16th century or 17th century
o Parochial church from the 17th century
o Franciscan Monastery on Skalice from the 18th century
In the Priko neighborhood, on the right bank of the Cetina River, stands the site with the most historic significance: the pre-Romanesque Church of St. Peter (Crkva Sv. Petra) from the tenth century A.D. This single-naved edifice, with a cupola and apse, was used in the 18th century as a Glagolithic seminary for novice priests.
The Omiš Riviera stretches for twenty kilometers along a coast of exceptional beauty, with many perfect pebble, sandy beaches, bays, steep cliffs and a crystal clear sea. The mood is caught in an inscription on the lintel of a Renaissance palace in Omiš: "GRATIAS AGO TIBI DOMINE QUIA FUI IN HOC MUNDO" (Thanks be to Thee o Lord, that I have lived on this Earth). The destinations of Radmanove Mlinice and the Gubavica waterfalls (Velika and Mala Gubavica) are also points of interest. Radmanove Mlinice, located five kilometers (3 miles) up to the canyon of Cetina River, is an excursion/picnic place famous for bread baked under an iron lid (peka) and for fresh trout that can be caught from the river.
The Cetina River is a great place for those who like active holidays (white water rafting, canoeing and kayaking). Recreational activities, in Omiš, also include: free climbing, cycling, tennis, football (soccer), basketball, 9-pin bowling, bocce, paragliding, beach volleyball, windsurfing, water-skiing, sea kayaking, waterpolo and scuba diving.
Omiš Festival of Dalmatian a capella singing groups / Click to enlarge
Omiš is best-known for the traditional klapa Festival (Festival of the Dalmatian a capella singing groups). This festival is the highlight of Omiš's summer, the expression of the city's beauty. Omiš's Summer Festival - during which various concerts and recitals are performed - takes place at the plazas and in churches.
* Omiš as a city has eight churches:
o church of Saint Michael
o church of Holy Ghost
o church of Saint Rock
o church of Saint Peter
o church of Saint Luca
o church of Saint Mary
o Franciscan Monastery with church of Our Lady of Carmel
o church of Saint Stephan and
o remains of church of Saint John in Borak.
* Other summertime cultural activities include:
o " Jure's poplars "
o " Fishing nights "
o " Swimming marathon "
o " Omiš triathlon "
o " Pirate nights "
o " Pirate battle "
o " Crazy dives "