Gal Potha (Stone Book) is one of the famous works of King Nissanka Malla (1187-1196) which describes himself, his rule and the eligibility for being a king of Sri Lanka. This massive slab which is 26’10” feet (8.2 meters) long and 4’7” feet (1.4 meters) in breath has been brought from Mahiyangana area by the worriers of King Nissanka Malla (1187-1196). The text is written in 3 columns and contains over 4300 characters in 72 lines. Those letters are belonging to 12th-century Sinhalese characters.

Beautiful carvings of two rows of geese (Hamsa) form the border of the side of the rock. Between this design at the center is a carved seated figure of Goddess Lakshmi holding two flowers and two elephants poring water on her from a container.