What is "solosmasthana"

Solosmasthana are 16 sacred places in Sri Lanka, believed by Buddhists to have been hallowed by visits of Gautama Buddha. These places of worship are among the most important religious locations in Sri Lanka, and are located throughout the country. Ancient Buddhist and historical sources of Sri Lanka assert that the Buddha visited the country on three occasions. These three visits are given in some detail in the ancient chronicle Mahavamsa, which describes his journeys to eleven of the Solosmasthana. Other sources such as the Pujavaliya, Samantapasadika and Butsarana also mention these visits.