Seljalandsfoss is one of the best known waterfalls in Iceland. Seljalandsfoss is located in the South Region in Iceland right by Route 1 (Iceland) and theroad that leads to Þórsmörk Road 249. The waterfall is one of the most popular waterfalls and natural wonders in Iceland. The waterfall drops 60 meters and is part of the Seljalands River that has its origin in the volcano glacier Eyjafjallajökull. One of the interesting things about this waterfall is that visitors can walk behind it into a small cave.