Buchan, a district in the N.E. of Aberdeenshire, between the Deveron and the Ythan. In parts the coast is high and abrupt, and the rock scenery magnificent. To the S. of Peterhead the sea enters through a natural archway into a well 50 ft. in diameter and 100 ft. deep, called the Bullers of Buchan. The Comyns were earls of Buchan, but forfeited the title in 1309. Buchan Ness, three miles S. of Peterhead, is the easternmost point of Scotland.