Ellidi is a name of a mountain in Northwest Iceland. It is located in Tröllaskagi peninsula.

The trail starts near the entrance to the University of Hólar, where the map of local trails can be found.
The path is hard to follow when you pass the wooden bridge so you can follow one of the tracks available on wikiloc.com.
The trip takes about 8-9 hours but the views from the top and along the river are worth the struggle.

The cache is a small container hidden at the highest point of the mountain.
If you make it to the cache be sure that you add more stones to the cairn to make it bigger :)