Mijaca is located in the City of Vrgorac, in Split-Dalmatia County at an elevation of 270 meters above sea level and it covers the area of 6.22 km² (2.40 sq. miles). According to the 2011 census report, there were 83 inhabitants. It is entirely populated by Croats. Nearby places: Stilja, Poljica Kozička, Zavojane, Prapatnice, Ravča, Dragljane, Banja, Slivno, Vlaka and Kotezi.