Beith is a small town in the Garnock Valley, North Ayrshire, Scotland approximately 20 miles south-west of Glasgow. The town is situated …Beith is a small town in the Garnock Valley, North Ayrshire, Scotland approximately 20 miles south-west of Glasgow. The town is situated on the crest of a hill and was known originally as the "Hill o' Beith" after its Court Hill.