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Filthingham (known as Rottingham in the British English dub) is a village, previously known for being the dirtiest place on Earth. It is currently sanitary and safe. It is located to the right of Purewood Forest.
Filthingham includes a large castle and other smaller tudor houses. Outside in the castle grounds is a circular fountain. Before Robin Hood cleaned Filthingham, mud puddles and grime could be found throughout the town.
Filthingham has appeared in one episode of The Backyardigans: "Robin Hood the Clean" from season three.