The Narrows is a 15-mile stretch where the North Fork of the Virgin River carved its way through rock, creating one long slot canyon. Most of the Narrows is located in Zion National Park, but the first section (if you hike from the top-down) begins on private property just northeast of the park. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.