The Odnesfossen is a waterfall in the river Odneselvi on the southside of the Næroyfjord where the fjord get more narrow (near Gudvangen). Only a 60 meter fall is visible at the end of the river at the Næroyfjord. Upstream, but not visible there must be more waterfalls. If you count in this part, the Odnesfossen is a waterfall with a height of 650 meters.
TheOdnesfossen can only be reached/viewed by boat when going through the Næroyfjord. From Aurland-Flam there is ferry going through the Næroyfjord to Undredal and Gudvangen. It takes two hours with the ferry to get from Flam to Gudvangen. Other possibility is to rent a canoe.
The Næroyfjord is a very narrow fjord and is a side arm of one of the deepest fjords in the world, the Sognefjord. Going through the Næroyfjord you can view several unnamed and named waterfalls like the Lægdafossen, Tuftofossen and the Styvefossen.
The Odnesfossen is an official named waterfall and can be found on all maps.