Portal:Rivers/Did you know/3


 * ... that a tributary of the Chusovaya River (pictured) naturally dives underground for about 6 km?
 * ... that the Cheddar Yeo forms the largest underground river system in Britain?
 * ... that the "Mad Raft Race" is an event held on the Chilkoot River as part of Fourth of July festivities observed in Haines, Alaska?