Derreen Garden lies on a promontory in Kilmakilloge Harbour on the Beara Peninsula, in Tuosist parish, near Kenmare in County Kerry, Ireland. The 4th Marquess of Lansdowne (1816–1866) initiated the planting of the garden in 1863, but it was his son and heir, The 5th Marquess of Lansdowne (1845–1927), who in his time served as Governor General of Canada, Viceroy of India, and British Secretary of State for Foreign Affairs, who from 1870 onwards gave the garden its present shape. Today it covers more than 60 acres and includes nearly 12 km of paths.