The Land of Ingary
is located in the northern part of the world of Howl's Moving Castle
and Castle in the Air
The climate seems to be similar to England in Our World.
The royal family of Ingary includes the King of Ingary; his daughter, Princess Valeria; and his brother, Prince Justin.
Specific towns and regions that appear in the books:
Market Chipping, Porthaven, Folding Valley, Kingsbury (the national capital), The Waste.
Other lands in the same world include the kingdoms of [High Norland]? and Strangia, somewhere near Ingary, and the Sultanates of Rashpuht, far to the south.
In Howl's Moving Castle, High Norland and Strangia are about to declare war on Ingary.
In Castle in the Air, Ingary has just won a war against Strangia, and Prince Justin is expected to marry [Princess Beatrice]? of Strangia.