Khwae Yai River

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"River Kwai" redirects here. For other rivers, see Khwae Noi River.
The bridge of the Burma Railway crosses the river at the town of Kanchanaburi.

The Khwae Yai River (Thai: แม่น้ำแควใหญ่, RTGS: Maenam Khwae Yai, IPA: [mɛ̂ːnáːm kʰwɛː jàj]), also known as the Si Sawat (แม่น้ำศรีสวัสดิ์  [mɛ̂ː náːm sǐː sa.wàt]), is a river in western Thailand. It has its source in the Tenasserim Hills and flows for about 380 kilometres through Sangkhla Buri, Si Sawat, and Mueang Districts of Kanchanaburi Province, where it merges with the Khwae Noi to form the Mae Klong River at Pak Phraek subdistrict.

The famous bridge of the Burma Railway crosses the river at Tha Makham Subdistrict of the Mueang District. However this is not the same bridge as depicted in The Bridge over the River Kwai by Pierre Boulle and in its film adaptation. A bridge was built of wood approximately 100 metres upriver from the current bridge, during the construction of the iron and concrete bridge and also rebuilt in 1945 when the iron bridge was bombed. No remnants of the wooden bridge remain. That wooden bridge was also not the bridge depicted in the film as the river was not called the Kwai Yai at that time. A wooden trestle bridge was built over the Kwai Noi many miles upstream in the jungle and it would more closely resemble the bridge in the film. However, the film is really a fictional depiction of the events with many inaccuracies and neither bridge can really be said to be that depicted in the film.

Up until the 1960s, the river was considered part of the Mae Klong itself, but this part of the Mae Klong was then renamed Khwae Yai to bring geographical fact more in line with the fictional association with the name 'River Kwai'.

Coordinates: 14°01′06″N 99°31′40″E / 14.0182°N 99.5277°E / 14.0182; 99.5277