If you've ever travelled to Yilan on Freeway Number 5, you might have glanced right just before you entered the first of the long tunnels and seen a tree-coated ridge running towards the west. If you're like me, that glimpse of intriguingly knobbly peaks and dips might have lead you to wonder what walking possibilities were hidden by the lush green foliage. The answer is the Bijia ridge trail - a strenuous, (but not difficult), and enjoyable trek which offers occasional great views and plenty of fun hiking.