DON, river, south Aberdeenshire, Scotland, rising in peat-moss to the east of Glen Avon on the borders of Banffshire, at a height of nearly 2,00o f t. It follows a generally easterly course, roughly parallel with that of the Dee, and a few miles north of it, falling into the North Sea close to Old Aberdeen, after a run of 82 m. At the mouth the two rivers are only 21 m. apart. Dee and Don are excellent salmon streams.