The Khmer Empire, flourishing from the 9th to the 15th centuries, holds great significance in Southeast Asian history as one of the region's most powerful and influential empires. It was known for its architectural wonders, including the iconic Angkor Wat temple, which symbolizes the empire's religious and cultural achievements. The empire facilitated trade, cultural exchange, and the spread of Hindu and Buddhist practices across Southeast Asia. Its sophisticated water management systems and urban planning also laid foundations for future civilizations in the region. The Khmer Empire's legacy continues to shape Cambodia's identity and influences modern Southeast Asian culture.