OMIŠ, a small town and port at the mouth of the Cetina river in the littoral of Poljica, 26 km southeast of Split; population 6,079. Extensive sand beaches stretch from Dugi Rat in the west to Ravnice in the east. A 700-m wide shallow stretches off the low sand coast west of Omis, created by the drifts of the Cetina; it has a changing depth (up to 2 m).