Spean Thmor, of which an arch and several piers remain, is 200m east of Thommanon. Jayavarman VII constructed many roads with these immense stone bridges spanning watercourses. This is the only large bridge remaining in the immediate vicinity of Angkor. It vividly highlights how the water level has changed over the centuries and may offer another clue to the collapse of Angkor’s extensive irrigation system. Just north of Spean Thmor is a large water wheel.
There are more-spectacular examples of these ancient bridges elsewhere in Siem Reap Province, such as Spean Preah Tuos, with 19 arches, in Kompong Kdei on NH6 from Phnom Penh; and Spean Ta Ong, a 77m bridge with a beautiful naga, forgotten in the forest about 28km east of Beng Mealea.