Omis is located southeast of the city of Split , which is only 21 kilometers away. It has excellent transport connections with this city , and buses run every 20 minutes . The city includes: Borak, Cerina, Cišla, Donji Dolac, Blato na Cetini, Gata, Dubrava, Kostanje, Gornji Dolac, Kucice, Lokva Rogoznica, Marušići, Mimice, Natklice, Seoca, Slime, Tugare, and many others . 2011th year according to the census in Omis lived 14,936 inhabitants, of whom 7,489 were women . Omis covers an area of 266.2 square kilometers , and convenient location has had a major impact in the defense of the wars in the distant past . The town is situated at the mouth of the river Cetina , a stone door through which the river flows into the sea makes a recognizable symbol of the city and the river itself opens the only way to inland from the river Jadno to Vrulje . In the distant history this city was located in the hamlet Bucici. Origin of the name of the city can be found in the Slavic word holm that is a ...translation of the Greek word Oneon , representing the hill or mountain . In the Middle Ages the city was named Olmissium and during the Venice - Almissa . Today's name is derived from medieval times , and medieval names . The townspeople were in the past engaged in piracy and were very famous pirates , and thanks to that gained without major conflict assets. Well known dukes Kacici were commanders of Omis pirates who have fought two centuries and seized merchant ships of Split , Venice , Dubrovnik and Kotor . After Kačići came Subici. It is worth mentioning that after Ladislav Napuljski in 1409th sold Dalmatia to Venice, in 1444th, Omis had begun be part of the Venetians until the 1797th. After the fall of Venice the city was annexed to Austria until 1805th, and then the French took over until the 1813th. Fortress Fortica is the most important cultural heritage , which involves a history of Omis piracy. It is situated at the top of Dinara , so the pirates could monitor areas on land and sea . Specifically from this tower extends view to the river Cetina , Solta , Brac and Hvar . Fortress served as a shelter and defense , and in the case that the Omis was attacked, from the fortress would be thrown huge stones to destroy the enemy , but it also woul destroy the entire city . Nowadays fortress can easily be reached , a beautiful trail with signs has been built, so you can not get lost. You can also come to the fortress by foot from the city. Besides the fortress Fortica also known fortress is Mirabela Peovica . It is located within the boundaries along the river. This fort is the old part of the city walls dating from the 13th century . Role of Peovica or Mirabella was monitoring the enemies , because it provided a very good view of the whole part of the Old City ( Dude, Duca and Punta ) , but also on the whole Brač area . The fort has four floors , and the top has a beautiful view . Well known is the parish church of Sv. Mihovila, which was built in the early 17th century , and contains an inscription in Latin on the side door of the church . Bell tower was completed in the 18th century , the church was built by a local builder . It contains elements of Gothic , Renaissance and early Baroque . In the church is situated a statue of Sv. Mihovil and rose windows , and on the walls of the church there are famous Venetian rulers crests and coat of arms of the town of Omis . Tourism is highly developed in this city, thanks to the beautiful naturee that surrounds it on all sides . Omis Riviera is about 30 kilometers long and adorned with all kinds of beaches. The rich tourist offer will certainly delight you , if you are among those who want to escape from the traffic jams here you can enjoy the peace and green wealth and if you want sport recreation and active recreation, you at the right place . The activities offered are diving, sailing , volleyball , rock climbing , as well as rafting on the river Cetina .