The town is approximately 25 kilometres (16 miles) south-east of Croatia's second largest city, Split, where the Cetina River meets the Adriatic Sea.

[5] Omiš was well known in the past by the Corsairs of Almissa (Omiški gusari)[6] 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[7] (Poljička Republika), became their friends and allies.

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.

Within the limits of the town lie the following settlements:[3] Omiš is best known for the traditional festival of the Dalmatian a cappella singing groups.