St James's Park is the oldest of the Royal Parks of London. It stretches from Buckingham Palace at one end to Horse Guards Parade at the other. The park has a small lake, St James's Park Lake, with two islands, Duck Island (named for the lake's collection of waterfowl), and West Island.
A bridge across the lake affords a westward view of Buckingham Palace framed by trees and fountains, and a view of the Foreign and Commonwealth Office, similarly framed, to the east.
View a video of St James Park on Google Maps