 There is also a belief that the word "poso" came from the word "maposo" in the local To Pobare'e language which means "break".Whereas according to several notable Poso people, the word "poso" actually came from the word "poso'o" that means "fasterner" or "bonds", that gave the name to Poso city with the intention to bind or to unite among the Pamona people that came from the mountains (lake side) and also those that came from the coastal region.While the origin of the name "Poso" which means "break" is said to have started from the formation of Lake Poso.