Denali Outdoor Center, Nenana River Canyon Run, Razorback Rapid.

Nenana River paddle-rafters prepare for lower Razorback Rapid. This well-known rapid is the site of the annual whitewater slalom race held the third week of July. River runners can experience the river on a paddle raft, oar raft, or kayaks with Denali Outdoor Center. (Credit Denali Outdoor Center)