Kalkallo is located amongst the large Gilgai plain. Other towns and villages in the shire included Delungra, Gilgai, Stannifer and Wandera. The area around Gilgai is dotted with mine shafts that are unique in Australia. Both circular and stepped gilgai have been found in the desert. The name Gilgai is an Aboriginal word meaning 'waterhole'. The next village encountered is Gilgai which is situated about south of Inverell. At the 2006 census, Gilgai had a population of 289 people.