Andover is a town in the Test Valley district of Hampshire, England. The town is on the River Anton, a major tributary of the Test, and lies alongside the major A303 trunk road at the eastern end of Salisbury Plain, 18 miles west of the town of Basingstoke. It is 14 miles from Winchester, 35 miles north of Southampton and 65 miles from London. The town developed as a centre for grain milling and wool processing, and in the 20th century it took on a significant Armed Forces presence.