The ubosot or ordination hall was rectangular and stood west of the main prang. The hall
had a double entry to the west and two exits on the sides near the main pedestal which
contained the presiding Buddha image. The hall was surrounded by an inner wall (Th:
kamphaeng kaeo, literally Crystal Wall), forming an inner court which gave access to the
gallery. Outside and around the ubosot were eight boundary stones or marker slabs (Th:
bai sema) at the eight cardinal points in order to demarcate the sacred area of the
Sangkha (Buddhist brotherhood). Two sets of marker slabs were found in this area. The
first set was made of reddish stone measuring 1 m x 67 cm x 11 cm. The second set was
made of fine greenish stone and had the characteristics of Sukhothai’s boundary stones,
measuring 1.12 m x 72 cm x 8 cm. The stones are believed to have been made in 1374
CE during King Ramesuan’s reign.