[1] The castle is situated in the parish of German (but close to the boundary with Marown) on the main A1 Peel Road in the Isle of Man.
The castle is situated where the main road crosses the watershed between the east and west of the island.
At the base of Greeba Mountain and the Kings Forest, or Greeba Plantation, there are two Victorian castellated residences built in 1849 in an elevated position in the Gothic style, on the site of a property that had been known as Booilrenny (perhaps boayl rennee, "place of the fern").
[3] The Victorian novelist Hall Caine moved to the Isle of Man in 1894 and rented Greeba Castle for a six-month period before residing briefly in Peel.
[5] The castle is between the 5th and 6th milestone roadside markers on the Snaefell Mountain Course used for the Isle of Man TT and Manx Grand Prix races.