Wallonia
From Tardis Wiki, the free Doctor Who reference
Wallonia was the southern part of Belgium. Waterloo was located there, as was Plancenoit. (AUDIO: The Curse of Davros)
Both the Second Doctor and the Sixth Doctor were present there, at the Battle of Waterloo on 18 June 1815. (PROSE: World Game, AUDIO: The Curse of Davros)