The Keriau or Krio River is a tributary of the Pawan River in West Kalimantan, Indonesia.
The upper course of the river was the location of the Ulu Aik Kingdom (est. around 1700), later renamed Hulu Aik.
The Krio River rapids are reached by starting from Pontianak in the direction of Ketapang by speedboat for six hours, then a four-hour trip in a smaller boat.
References
Keriau River Wikipedia(Text) CC BY-SA