Ramblers of all ages and abilities are being encouraged to sign up to the 33rd annual Maidenhead Boundary Walk.
The Rotary Club of Maidenhead event, which often attracts several hundred walkers, is due to be held on Sunday, October 5 and takes participants on a 13-mile route around the old boundaries of town.
It starts at 9-10am at Boulters Lock car park in Lower Cookham Road before leading towards Bray.
Weather permitting this will be followed by a river crossing, to be manned by the Sea Cadets, before the route continues towards Cox Green, Pinkneys Green, Switchback Road North and towards Widbrook Common before it rejoins the river route to Boulters Lock.
The Boundary Walk is based on an ancient custom called Beating the Bounds.
The tradition dates back to medieval times when parishes reaffirmed their boundaries by beating each boundary mark with wands which they believed would protect and bless the land.
The original boundary of Maidenhead was established in 1582 and the Royal Borough installed stones to mark the borders in 1934 - although the town has now extended beyond these.
The boundary stones can still be seen and are the basis for the route of the walk.
Walkers are encouraged to raise money for a charity of their choice.
Last year's event brought in more than £13,000.
Boundary Walk committee chairman Graham Brunsden said: "People should remember they don't have to do the whole walk, they can stop at one of the check points."
He added: "If they haven't done it before they will see parts of Maidenhead they didn't know about."
There will also be a trophy given to the group with the most walkers.
All groups of 15 people or more are required to sign up before Sunday, September 14.
Entry is £3 for adults and 50p for children under the age of 12.
Visit boundarywalk.org.uk for details.
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