Here, remnants of 12th-century temples share the landscape with wild forests, Buddhist monasteries, and small villages. Diverse ecosystems, from the mighty Mekong River to the dense highland forests of Mondulkiri, are home to rare species like the Asian elephant, sun bear, and Irrawaddy dolphin. The Tonle Sap Lake swells exponentially each year with the monsoon season, creating a dramatic seasonal shift for the fishing and farming communities and wildlife of this flooded region.