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In page Mainland Southeast Asia:

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Mainland Southeast Asia is separated from the archipelagoes of Maritime Southeast Asia primarily by the South China Sea to the east and southeast, the Strait of Malacca to the south, and the Andaman Sea to the west. The maritime region comprises islands and archipelagos. The physical geography of Peninsular Malaysia connects via the Kra Isthmus to Thailand which makes it part of Mainland Southeast Asia.[1][2][3][4][5] Malaysia is both mainland and insular.[4] East Malaysia is in Borneo so it is variably considered part of Maritime Southeast Asia.[citation needed]