North Bengal Tea producing areas include district of Darjeeling, Jalpaiguri, Cooch Behar, Kishanganj and North Dinajpur. North Bengal has about 450 tea gardens spread out in the Darjeeling hills, Terai and Dooars region that are registered as sellers in the Siliguri Tea Auction Centre. The youngest tea gardens are Chinchula Tea Estate,Raimatang Tea Estate and Kalchini Tea Estate all of which are 72 years old. The largest tea garden is Samsing Tea Estate of 1256.60 hectares. Most of the tea gardens in the Dooars region are members of the Dooars Branch Indian Tea Association(DBITA), while those in the Terai region are members of the Terai Branch Indian Tea Association(TBITA)