Wiltshire is bounded by Somerset, Gloucester, Berkshire, Hampshire, Dorsetshire. It is 54 miles in length and 33 miles in breadth.
Principal city is Salisbury, and it contains 304 parishes, 21 market towns. The north of the county is hilly and the south is level. Includes Stonehenge and the White Horse. Main rivers: Willey, Adder, 2 Avons, Thames and Kennet

Wiltshire County Council Statistics:

The National 85 Mile Ridgeway Trail starts near Avebury and the trail ends at Ivinghoe Beacon in Buckinghamshire. Much of it can be ridden. 

Links:  http://www.nationaltrail.co.uk/ridgeway/        http://www.ridgewayfriends.org.uk/index.html

Also see https://www.bhsaccess.org.uk/ridemaps/southwest for more trails

Wiltshire County Council Rights of Way Map

Wiltshire County Council - From 1st April 2009 became a Unitary Authority - District Councils being abolished.

Link:
 http://www2.wiltshire.gov.uk/countryside-access-and-public-rights-of-way

Contact Details:

The Rights of Way and Land Charges Manager
Environmental Services Department
Wiltshire County Council
County Hall
Bythesea Road
Trowbridge, BA14 8JD

By Email: rightsofway@wiltshire.gov.uk Tel: 0300 456 0100

Swindon Borough Council (Unitary):

https://www.swindon.gov.uk/info/20031/roads_parking_and_transport/570/public_rights_of_way

BHS Access and Bridleways Officers: See BHS Wiltshire Committee

Wiltshire Bridleways Association: Wiltshire Bridleways Association