Phaya Nak or Phaya Nāga or Nakkharat in Thai beliefs, nāgas are considered the patrons of water. Nāgas are believed to live in either water bodies or in caves. According to a popular legend, the Mekong River in north-eastern Thailand and Laos was said to be created by two Nāga kings slithering through the area, thus creating the Mekong and the nearby Nan River. The Mekong is synonymous with the unexplained fireballs phenomenon which has long been believed to be created by the nāgas that dwell in the river. Common explanations of their sightings have been attributed to oarfish, elongated fish with red crests; however, these are exclusively marine and usually live at great depths. (source from wikipedia)
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