Mae Klong

Aerial photograph showing the mouth of the Mae Klong in Samut Songkhram Province

The Mae Klong (Thai: แม่น้ำแม่กลอง, RTGS: Maenam Mae Klong, Thai pronunciation: [mɛ̂ːnáːm mɛ̂ː klɔːŋ]) is a river in western Thailand. The river begins at the confluence of the Khwae Noi or Khwae Sai Yok and the Khwae Yai River or Khwae Si Sawat in Kanchanaburi, pass Ratchaburi Province and empties into the Gulf of Thailand in Samut Songkhram.

In the 1960s the upper stretch of the river until the town of Kanchanaburi was renamed to Khwae Yai (แควใหญ่, big tributary), as the famous Bridge on the River Kwai spanned the Mae Klong and not the Khwae (Kwai) river. However the actual origin of the river is in the Khuean Srinagarindra National Park in the north of Kanchanaburi Province.

Note that an early portion of Khwae Yai River in Amphoe Umphang, Tak Province is also called Klong River. It becomes known as Khwae Yai River when it flows into Kanchanaburi Province.

It feeds the giant Umphang Thee Lor Sue Waterfall in its upper reaches.