Thailand is the geographical heart of South-East Asia. The northern mountainous region contains numerous ruins and temples, and the ancient city of Chieng Mai. Central Thailand, consisting of the fertile plains surrounding the Chao Phraya River, is the country's most populous region and its food basket. The vibrant capital city of Bangkok is located along the banks of the Chao Phraya, near the river's outlet into the Gulf of Thailand. The southern region along the Malay Peninsula abounds with stunning beaches and scores of tropical islands. Pukhet, Koh Phi Phi, and Koh Samui are just a few of the famous beach resort areas.