Heading north from Siem Reap, Angkor Wat is the first major temple, followed by the walled city of Angkor Thom. To the east and west of this city are two vast former reservoirs, which once helped to feed the huge population; the eastern reservoir is now completely dried up. Further east are temples including Ta Prohm, Banteay Kdei and Pre Rup. North of Angkor Thom is Preah Khan, and way beyond in the northeast, Banteay Srei, Kbal Spean, Phnom Kulen and Beng Mealea. To the southeast of Siem Reap is the early Angkorian Roluos group of temples.