Železnik is located in the central part of the Čukarica municipality, 17 kilometres (11 miles) southwest from downtown Belgrade.

Several streams flow through the neighborhood, the creeks of Krušik and Krušički potok and a small river of Čitačka reka.

Soon, plans were made for a completely new settlement, a major and heavily industrialized suburb of Belgrade (Železnik, Serbian for Iron City), with a population of 80.000, but that goal is not achieved.

The city was to have numerous business buildings, department stores, hotels, educational facilities, scientific venues and medical institutes.

It stretches from the grade separating junction of Ivo Lola Ribar Street on the west, to the stadium of the FK Železnik on the east.

Unlike the village, it has straight streets, a clinic, post office, shopping mall, gas station, green market, etc.