Forest Park

Forest Park is the crown jewel of Portland trail running. It has a large variety of trails, from flat and fast to hilly and muddy. Whereas Wildwood Trail is relatively flat and easy to follow, the "Nasties" are not. They were designed by a mysterious Portland trail runner for hilly off-season training while the volcanoes and high trails of the northwest are under snow and ice. It's believed he also has an intention to increase the suffering in the world. 

A 2023 interview with the mysterious trail runner, on NW Dirt Churners.