Before revision: Water gaps of necessity often cut entirely through a barrier range and Riverine gaps may create canyonscanyons such as the riverine gaps of the Danube River, Lehigh River Gorge, the Colorado River's Grand Canyon , the Genesee River .
After revision: Water gaps of necessity often cut entirely through a barrier range and riverine gaps may create canyons such as the riverine gaps of the Danube Riverand Lehigh River Gorge, the Colorado River's Grand Canyon , the Genesee River .