Seljalandsfoss was the first waterfall we planned to stop to see in Iceland. It wasn’t the first waterfall we saw, though. They are literally everywhere in Iceland—estimates of the number of falls are as high as 10,000.
In Iceland, “foss” means waterfall. Therefore, to say something like Seljalandsfoss waterfall would be redundant or repetitive. If you wanted to say waterfall at the end, this one would be Seljalands waterfall. Seljalandsfoss is popular partly because it’s not too far from Reykjavik but also because you can walk behind it. Walking behind it is fun and will also get you wet, which makes it difficult to photograph without getting the lens completely wet.