What is "keselo"

Keselo is a small medieval fortress just above the village of Omalo in Tusheti (historic geographic area in eastern Georgia). The site is surrounded by the northern slopes of the Greater Caucasus Mountains. It is bordered in the north by Republic of Chechnya and Dagestan, in the east by the Georgian historic provinces Kakheti and Pshav-Khevsureti to the south. The population of the area is mainly ethnic Georgians called Tushs or Tushetians , However, there are some villages nearby which are populated by Daghestanis.