Peak District National Park said a section of its Monsal Trail is now closed to the west of Millers Dale Station, with no multi-user through route or alternative route to Blackwell Mill.
The closure, which is in place from today, has been forced by a risk of falling rocks from an unstable wall on adjacent private land above the trail.
A spokesperson for the Peak District National Park Authority which owns and manages the trail, said: “We have unfortunately had to close this section of the Monsal Trail for safety reasons.
"We are working to resolve the issue but are unable to give a reopening time for the closure.
“We urge all visitors, for their own safety and that of others, to please adhere to the closure.”
Updates will be provided across the Peak District National Park’s social media channels and website.