What are the best places in the world to mountain bike? Realizing that can be a pretty open-ended question the International Mountain Bicycling Association has nonetheless attempting to define the best rides for more than a decade.

Each year the association releases a list of “Epic Rides.” This year’s list of six trails from Oregon to Iceland average more than 60 miles and put even the most seasoned riders through a test of fortitude. Not to be outdone is the awe-inspiring scenery along the way. Here are the IMBA’s top 6 epic rides for 2015.