The Navel of the Mekhong River, which in Thai is known as Sadeua Mae Nahm Khong, is the name of a spot in the Mekhong River considered to be the point where the Mekong River is the deepest, with a depth that cannot be measured.

Here, the current is very turbulent, especially in the rainy season, when it generates a very large whirlpool, which can best be observed when large pieces of floating material or debris get caught in the cone-shaped vortex.

It pulls these objects into its empty centre and typically will make them spin for about 30 minutes before they break away from its pull and continue to flow downriver.

The Navel of the Mekhong River is about 300 meters wide and is believed to be the royal palace of the phayanagaraat, i.e. the Naga King. Hence, statues of this mythological snake are found here abundantly, placed along the river bank in its honour.