Sinjsko Polje, Karst field in Split-Dalmatia County, Croatia

Sinjsko Polje is a karst field in Zagora, covering 64 km² of fertile land between 295 and 301 metres above sea level, the largest field in the region. The Cetina enters near Han between Glavice and Gala and leaves below Trilj between Čaporice and Gardun, where it enters its canyon. The field is bordered by settlements including Sinj, Trilj, Gala, Otok, Ruda, Grab, Košute, Turjaci, Brnaze and Glavice, linked by several bridges over the Cetina.

The field formed through karst geology and was shaped over centuries by water that regularly flooded and receded with the seasons. These natural inundations created pastureland where livestock could graze, supporting the region's pastoral traditions.

The field's name comes from the town of Sinj at its edge. Until recently the Cetina and its tributaries Grab, Ruda and Rumina held native trout with red spots, chub and grayling; fishing families along the banks worked these waters, and the catch has declined over recent decades.

The area is easily accessible by car with multiple crossing points over the river for through traffic. During wetter months some roads can become muddy, so caution is advisable if you plan to explore the back roads and farming tracks.

The field is crisscrossed by several tributary streams feeding into the main river, creating a complex water network that sustains the land. This intricate system of waterways makes the area rich in wildlife and particularly valuable for farming.