The Polongo River is a great river in western Dinotopia.[1] It has its source in the Rainy Basin and runs north-south on the western side of the island. Both Waterfall City and Sauropolis, and several minor settlements are located along the river. The river ends in Dolphin Bay, where it meets the sea.[2]


  1. Dinotopia: A Land Apart from Time, p. 57
  2. Traveler's Map of Dinotopia