6 20.6km / 12.8 miles / 7-7.5 hours Ascent 1122m/3680ft

4 38.9km / 24.2 miles / 12-14 hours Ascent 2927m/9603ft

5 15.6 km / 9.7 miles / 6 hours Ascent 1080m/3543ft

■ Distance: 5½ miles/8.7km ■ Time: 3½-4½ hours ...

We arrive at the top of High Cup Nick in the North Pennines. “It’s like the world starts just over there,” comments my friend Mark. He’s pointing down the U-shaped chasm of High Cup Gill, beyond whose

■ Distance: 6½ miles/10.5km ■ Time: 4 hours ■ ...