Six kilometres west of Kampong Cham, two small limestone hills rise from the flat rice paddy. Phnom Pros ("Man Hill") has a road that climbs to the top, where a modern Buddhist temple and a memorial to Khmer Rouge victims overlook the surrounding plain. Phnom Srei ("Woman Hill"), opposite, is the taller and quieter of the two — a stiff climb up cracked concrete steps through scrub forest, with macaque monkeys watching from the trees and a small ruined shrine at the summit.
The view from either hill stretches across the Mekong plain to the river, and both are good places to be at sunset. The site is one of the few mass-grave memorials outside Phnom Penh: the simple stupa on Phnom Pros holds the skulls of Khmer Rouge victims murdered nearby.