Kosmaj is a mountain south of Belgrade. With an elevation of 626 meters, it is the highest point of the entire Belgrade City area and is nicknamed one of two "Belgrade mountains".

Topčiderska River, or colloquially Topčiderka, or Topčiderski Creek, is a river in north-central Serbia, a 30 km-long right tributary to the Sava river to which it flows in the urban section of Belgrade. It is one of the 40 rivers, streams and creeks that flow or used to flow through Belgrade.