Bai sema

Photo 1: Bai sema at Wat Mahathat, Sukhothai Historical Park

Bai sema (Thai: ใบเสมา, pronounced [bāj sěː.māː]) are boundary stones which designate the sacred area for a phra ubosot (ordination hall) within a Thai Buddhist temple (wat); otherwise called sema hin (เสมาหิน).[citation needed]