Seljalandsfoss is one of Iceland’s most popular waterfalls. It is invigorating to watch the Seljalandsá River from the Eyjafjallajökull glacier rush over the ledge and plunge 197 feet. The resulting spray causes rainbows to dance in the sunlight. Most exciting is the chance to explore a narrow trail behind the foss. You will feel the water’s power and hear its roar. You will also get wet. So, wear rain gear, good hiking shoes and your biggest smile.