Seljalandsfoss waterfall in Iceland is a popular spot where visitors can walk behind the cascading water. Located in south Iceland just off Route 1, also known as the Ring Road, Seljalandsfoss offers a unique experience with its cave-like overhang that allows you to see through the waterfall to the front side. While there isn't a formal hike to reach the waterfall, a casual walk from the parking lot leads to a viewpoint of the falls. Make sure to wear waterproof gear, especially if you plan to explore behind the waterfall, and enjoy the beauty of this natural wonder!