The highest point of the country is Doi Inthanon whose summit peaks at 8,451 ft. (2,576 m); the lowest point is the Gulf of Thailand (0 m).
Thailand's fertile central plain is dominated by the Chao Phraya River, which flows for 231 miles (372 km), and is home to some of the most historically significant and densely populated settlements of Thailand; the river and its tributaries drain into a delta south of Bangkok.
The Khorat Plateau, a region of rolling low hills and small, shallow lakes, drains into the Mekong River system on its border with Laos.
Along its southern peninsula (Isthmus of Kra) the land fades into mangrove swamps. Numerous islands are found off the coastline, with Phuket being the most famous.