Rappahannock Creek is a creek where Greg Heffley and Frank Heffley go rowing sometime before the events of Dog Days. Greg tells Frank to duck as he is about to hit a branch, although Frank thinks there is an actual duck, causing him to look for it with binoculars. He is hit by the branch and falls into the creek. It is likely based on the real life Rappahannock River in Virginia.
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Greg tells his dad to duck down on the branch stick while Frank is using his binoculars to look out.
A real life Rappahannock River.