97) Thrybergh Country Park, Doncaster Rd, Thrybergh, Rotherham, South Yorkshire, S65 4NU
https://www.rotherham.gov.uk/directory-record/126505/thrybergh-country-park

Route:
5 km circular but you can add little sections to leave the reserve if you wish.
Terrain: hard standing - good paths mostly - some sections were quite muddy when we visited (Jan 2023).

Terrain:
largely even,  mostly flat surfaces with a few small hills. the route is probably best done in a clockwise direction so the steepest hill on the route becomes an easier short, but not silly steep downhill section. Typically, today we did the route anti-clockwise so a small push on the hill was needed. Some sections of paths were being remade / upgraded during our visit (Jan 2023).

Facilities on site:
Good sized car parking - free for blue badge users.
Cafe - reasonably prices and good quality food and drinks, disabled toilets are provided. 
Dogs are permitted over the whole site as long as they are on leads or under good control, only guide / service dogs are permitted inside the actual cafe.
Bird hide- has an accessible viewing window.
No steps or stiles on site, a couple of A frames to negotiate through which many be a problem for larger mobility scooters and trampers types of mobility equipment users.
The web site does state that the site has a mobility scooter available to hire on site.

About the site:
Thrybergh Country Park is a reservoir and nature reserve on the outskirts of Rotherham, South Yorkshire. The reservoir was constructed in 1876 and was operational in 1880, to provide fresh drinking water for the population of nearby Doncaster. It became a nature reserve in 1983 - owned and operated by Rotherham Metropolitan Council. Over 155 species of birds, over 20 species of mammal and 170 species of plants have been recorded across the site. Lots of geese, ducks including a drake Smew, moorland and garden birds, buzzards, kestrel, so plenty to see.