Indochina, Mainland Southeast Asia, or the Indochinese Peninsula is a large peninsula in Southeast Asia. It constitutes the territory of the following countries:

• Cambodia
• Laos
• Myanmar, formerly known as Burma
• Peninsular Malaysia (not Sabah or Sarawak)
• Thailand
• Vietnam

French Indochina included the nations of Laos, Cambodia and Vietnam.

The main religion in this region is Theravada or Hinayana Buddhism. Mahayana Buddhism is predominant in Vietnam, while Malaysia is a multi-religious nation, with Islam as the main religion, and Buddhist, Hindu, and Christian minorities.

See also

• Malay Peninsula
• Maritime Southeast Asia
• East Indies