Runners of all abilities are invited to take part in the scenic Dunstable Downs 5k and 10k trail runs on Sunday, May 18.
The challenging race covers open chalk grassland, fields, footpaths and bridleways across the National Trust’s Area of Outstanding Natural Beauty.
Organiser Mark Cornell said: “The first three miles is on the top of the Downs and it is mostly flat.
“The route then drops to run along the base of the Downs along bridleways - this is undulating. At 4.5 miles the route climbs ‘The Bison’ after that it is pretty flat, running along footpaths.
“Around the top of the Downs the route is very scenic with some fantastic views in places.”
The event starts and finishes outside of the Chilterns Gateway Centre at 10am. Entry is £12 - less for affiliated club runners.