Selfoss is one of the three waterfalls of river Jokulsa a Fjollum.  It is located about one kilometre to the south of the mighty Dettifoss.  It is 10 m high (8-14 m) and often its spray is visible from the brink of the canyon on the way to Dettifoss.  It derives its name from the abandoned farm Holssel.  Some people called it Willard waterfall, named it after Willard Fiske.  It is a special and a beautiful waterfall and those who have the time, should make an extra detour to see it.