The purpose of this paper was to present the forts in the lower course of Cetina, the longest river in Dalmatia. Throughout history the river served as an important defensive and strategic position. It controlled trade and access towards the coast. In high and late middle ages many noble families feuded over territories adjacent to the river. They built forts that served as chokepoints and controlled the important crossings over the river as well the surrounding area. The forts were later used defensively against the Ottoman empire which made use of the forts themselves. After liberation in the 17th century the forts soon lost their military purpose since the frontier moved to the northeast. Available archaeological research allows us to conclude that the forts had many similarities. One such similarity are round towers which every fort along the lower course of the stream possessed except the forts around Omiš. The forts in Omiš, Viseć and Starigrad mostly had towers which were polygonal or square shaped. Each fort adapted to its terrain configuration and was built in similar style of the late middle ages.