Sthreepura is a centuries old cave & tunnel complex located in Kiriwanagama, in Welimada District of Uva Province of Sri Lanka, 116 KM from Colombo. Sthree Pura means a zone of women in Sinhal a language. 

According to Ramayana Yatra Sri Lanka 

It is believed that the Sthreepura cave had been used by King Ravana to hide the Princess Sita Devi as a precautionary measure during the battle between King Rama & King Ravana.  There are remains of rock caves and interconnecting tunnels located at this site which have been built during the reign of king Ravana according to the folklore. Ishtreepura seems to be a part of a network of tunnels, which is interconnected to all the major areas of King Ravana’s city. These tunnels are yet to be explored. Sthreepura is one of the important Ramayana Sites of Sri Lanka. 

Technical details of Sthreepura Caves 

Sthreepura Cave at Kiriwanagama consists of an upper level of cavities in quartzite formed by arenization and a lower level developed in a saprolite formed from the weathering of gneiss sandwiched between two layers of quartzite. The lower level cave is not like most arenization and phantom rock caves as the walls are composed of saprolite, not exhumed un weathered rock. Reference: pathmakumara jayasingha

Note 

Sthreepura Cave at Kiriwanagama in Uva Province is not to be confused with Sthreepura Cave at Batathota or the now flooded Sthreepura Cave at Pannala (Basnayake 1983).