This must be one of the most famous waterfalls in Iceland. Seljalandsfoss is an absolute beauty and you can even walk behind it (if it is not too slippery in wintertime).

The waterfall is right on the ring road and you will be able to spot it from quite a distance.

Since a few years you need to pay a parking fee when visiting Seljalandsfoss. There's no time limit to it though, so for a small fee you can park here as long as you like and explore the area (there are several waterfalls in this area).