Cambodia's 500,000 Cham Muslims live quietly alongside their neighbors in rural areas and urban centers from Battambang to Kampong Cham provinces. Most of them are descendants of the lost Champa empire, which had its seat in today's Vietnam, and are of the Sunni branch of Islam. The Chams have their own language and culture, a civilization within a nation. VOA Khmer presents an occasional series on one of Cambodia's often-forgotten cultures.