The TARC Wapack and Back Trail Races consist of both the 50 mile and 43 mile ultramarathons and an end to end 21.5 mile trail race on the Wapack Trail. Leading from Mt Watatic in Massachusetts to North Pack Mt in Greenfield, NH, the rocky ledges of this technical trail (approximately 4,600 feet of elevation in each direction, 50 miler is around 10,800 feet of elevation) afford views of the Boston skyline to the east, Berkshire and Green Mountains to the west and White Mountains to the north. It offers boulder fields, rocky ledges, granite slabs, lots of single track with rocks and roots, and a little fire road action.