The cam sành (Vietnamese for “green orange”) is a cultivar of citrus fruit similar to an orange, originating in Vietnam. The fruit may be easily recognised by its thick skin, which is typically bright green (because of which, it is sometimes referred to as a green orange), although the skin may also be partly green and partly orange, or entirely orange. Its flesh is orange, dark and sweet.
The fruit is a natural hybrid of the Mandarin orange (C. reticulata or C. nobilis) and the pomelo (C. maxima). It is one among many citrus fruits from the region. These include the closely related yellow cam canh and reddish to yellow cam bo ha mandarin – pomelos hybrids; the orange-coloured chun or sen, yellow bak son, and pink hong orange – mandarin hybrids or “king mandarins” (C. reticulata × C. sinensis); as well as at least three non-hybridised mandarin (C. reticulata) varietals. The term “king mandarin” is sometimes applied to the cam sành itself.