Ostru nica is a suburban settlement of Belgrade, the capital of Serbia. It is located in the municipality of ukarica. Ostru nica is located on the right bank of the Sava river, at the mouth of the Ostru ni ka reka, 14 km southwest of Belgrade, south of the Ada Ciganlija island. It is an urban settlement, with fluctuating number of population. In the last 40 years, it experienced a slow groth, stagnation, depopulation and accelerated growth above the Serbia's average.