Keith Inch (originally Keith Insche, Keithinche or Caikinche) Greenhill Road leads the motorist onto Greenhill from the town via Alexandra Parade.
It forms part of Peterhead Harbour. Inch is a common Scottish word for an island, such as Inchcolm, Inchkenneth and (Hebrides), and derives from the Scottish Gaelic .
thumb|Remains of the whale bone arch in Peterhead Harbour
It was used in the whaling industry, and boil yards were here; the remains of a whale bone arch can be seen.
Castle of Keith Inch
On the island of Keith Inch once stood a castle built by George Keith, 5th Earl Marischal, in the late 16th century. The castle is thought to have been modelled on the castle of Kronborg in Denmark.