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The shape of the main arc formed by the Canis Major clouds has been suggestedto result from a supernova explosion possibly triggering the recent starformation activity. The presence of dozens of OB stars and reflection nebulaeforms the CMa OB1/R1 associations. More than a hundred emission line stars arefound in this region, including the famous Z CMa, a binary system containing aHerbig Be star and a FUor companion. Several embedded infrared clusters withdifferent ages are associated with the CMa clouds. The main characteristics ofthe region in terms of cloud structure, stellar content, age of associatedyoung clusters, distance, and X-ray emission are presented in this chapter.Some of the arguments in favor and against the hypothesis of induced starformation are discussed in the last section.

The Canis Major Star Forming Region