It is estimated more than £250,000 could be raised for about 25 local charity partners on Sunday.
Organisers of one of UK's flattest marathon races said a record number of participants were set to take part in this year's event.
Nearly 6,500 runners are expected to line up on Sunday for Peterborough's AEPG Great Eastern Run, with 84-year-old as the oldest runner.
The marathon's organisers, Good Running Events, confirmed a new route for the 2025 race to accommodate the large number of participants, which will see them run through large sections of the city centre.
It is estimated more than £250,000 could be raised from the marathon, with funds going towards about 25 local charity partners, including Annas Hope and Sue Ryder.
Aaron Murrell, the director at Good Running Events, said: "The AEPG Great Eastern Run is a highlight of the events calendar in Peterborough, and we are incredibly proud to see the event continue to grow.
"This year we are expecting the event's largest number of finishers ever, which is a real testament to the community spirit and the support of our partners, volunteers, and runners.
The route
The run will start at 10:00 BST preceded by Anna's Hope 5K run at 09:00 BST.
The 13.1 miles (21km) course will start from Bishop's Road, before running through the city centre via Bridge Street and Bourges Boulevard and ending on the Embankment.
Organisers have confirmed an improved route for 2025, which was designed to enhance the runner experience.
This year's course will see participants enjoy large sections through the city centre, Central Park, Dogsthorpe, Paston and Werrington and the city's cathedral on their return to the city centre.
The race is expected to finish around 14:00 BST.
What to expect
Participants have been advised to arrive at least an hour before their race begins to allow time for bag drop, warm up and use the toilet.
Road closures across Peterborough will be in place including around the Central Park, Bourges Boulevard and Paston Ridings. The full map can be viewed here.
City Centre car parks including the Regional Pool car park, Fletton Quays and Brook Street will be available on race day. Although the Bishop's Road car park, Riverside (Key Theatre) and Car Haven will not be open to use.
A baggage drop facility and toilets along sections of the course will be available for runners within the event village.
To drop your bag, you need to arrive at the assigned queue based on your race number - and then produce your race number when you return after your run.
British Sign Language interpreters will also be on site at the start of the race and at the finish line, signing all the key announcements as runners cross the line and celebrations get under way.
Medical teams and emergency services will also be around the race route to offer help in case of any incidents.
Spectators are encouraged to line the route and cheer on participants.
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