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|First appearance||King Ottokar's Sceptre|
Douma is a city in the Hum Province of Syldavia. It is located at the South-Western part of the country, built near the Wladir River. Douma, an Adriatic Sea seaport, is the main coastal gate to the country, as it is one of the chief ports. There is also a seaplane port located in the city. Tintin, Snowy and Thompson and Thompson use the seaplane port to return home via Marseille. Douma is supposed to be inspired by the city of Metkovic in Croatia.