The Calculus Affair
Syldavia is a fictional country in "The Adventures of Tintin", the comics series by Belgian cartoonist Hergé. It is located in the Balkans and has a rivalry with the fictional neighbouring country of Borduria. Syldavia is depicted in "King Ottokar's Sceptre" (1938–1939), "Destination Moon" (1950), "Explorers on the Moon" (1952–1953, briefly), "The Calculus Affair" (1954–1956), and "Tintin and the Lake of Sharks" (1972), and is mentioned in "Tintin and the Picaros" (1975–1976).