19 county durham cornsay colliery

■Distance: 8¼ miles/13.3km ■ Time: 4 hours ■ Grade: Moderate

■Distance: 4 ¾ miles/7.8km ■ Time: 2 hours ■ Grade: Moderate

This is the glacial valley no one’s heard of... Head to the South Pennines to explore both sides of this steep gulch between Burnley and Todmorden.

■Distance: 8 miles/12.8km ■ Time: 4 hours ■ Grade: Challenging

■Distance: 5 miles/8km ■Time: 3 hours ■Grade: Moderate

■Distance: 6¾ miles/10.9km ■ Time: 5-6 hours ■ Grade: Challenging