The Old Town of Zvornik (Djurdjevgrad or Kula Grad) was a single entity although it differed in three parts: Upper, Middle and Lower Town. Upper Town is situated on the plateau of the hill which is shaped ring and above the cliffs which are cascading fall towards the Drina River. Lower Town is located by The Drina River and by the road leading it. Middle Town is situated in the space between the Lower and Upper Town, starting form the Old Castle (Great Tower) and down to the cliffs of the Lower Town.
At the beginning of 15th century under the Zvornik fortress (outside the walls of the old town) was formed the Town outskirts "Podvoznik" (today Zvornik) which was risen the most during the Medieval period (before the Ottoman Empire) or rather in the first half of the 15th century. Outskirts of Zvornik was known borough in The Middle Ages with over 2,000 citizens and counted in a medium-sized cities in Europe, which according to contemporary categorization count between 2,000 and 10,000 inhabitants.