I think this areas is called the Leper King Terrace on the North end of the Terrace of the Elephants in the Angkor Thom complex, north of Bayon temple (Siem Reap, Cambodia). There is a narrow pathway that winds between the wall of the terrace.

Related: Buddhist Temple Adjacent to Bayon Temple – Bayon Temple, Siem Reap, Cambodia – Carving at Angor Wat