Cam sành () or King orange ( Citrus reticulata × sinensis) is a citrus hybrid originating in Vietnam.
Cam sành is Vietnamese for "terracotta orange", although the fruit is more akin to a mandarin orange or tangerine. The fruit may be easily recognized by its thick skin, which is typically bright green, although the skin may also be partly green and partly orange, or entirely orange. Its flesh is orange, dark and sweet. This is the most popular orange variety in Vietnam and Cambodia.
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– hybrids; the orange-colored 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-hybridized mandarin ( C. reticulata) varietals. The term "king mandarin" is sometimes applied to the cam sành itself.
In Vietnam, the tree is cultivated in the Mỏ Cày district, Bến Tre province, as well as the northern mountainous areas. It has also been grown in the Bố Hạ region of Yên Thế (Yên District) of Bắc Giang province, but had been eradicated due to the citrus greening disease. Nowadays, cam sành is planted widely in northeastern Vietnam (particularly Hà Giang, Tuyên Quang, and Yên Bái), as well as in several provinces of the Mekong Delta in the south, including Vĩnh Long, Cần Thơ, and Tiền Giang.
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