Many Chuvash villages had a strict street planning. Villages were divided into streets (“kas”); they were often fortified with an armed fence, surrounded with a rampart and a ditch, especially in steppe and forest-steppe regions, people of which often had to do with Nogay and Tatar nomads. According to the tradition Upper Chuvash villages (that is in the Northern part of Chuvashia) had few yards (30-70 farmsteads) in comparison with Middle Lower and especially Lower Chuvash villages (up to 1000 yards) in the South and beyond the bounds of the region.