Moth,

they are within 30 seconds walk of each other, fairly close to a car park, Brisworthy is the bigger site, a classic stone circle, Ringmooor is smaller with a long stone row. Not sure how connected they are in 'usage' but you can't visit one without the other. There's also some grassy barrows in the 'field'. If you have time take a walk over to Drizzlecombe, you will not be disappointed.

Enjoy.

johan