Launceston ( LAHN-stən, LAWN-, locally LA(H)N-sən; rarely spelled Lanson as a local abbreviation; Cornish: Lannstevan) is a town, ancient borough, and civil parish in Cornwall, England, United Kingdom. It is 1 mile (1.6 km) west of the middle stage of the River Tamar, which constitutes almost the entire border between Cornwall and Devon. The...