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Tea became a major export of Bengal. Northwestern Bengal became the center of Darjeeling tea cultivation in the foothills of the Himalayas. Darjeeling tea became one of the most reputed tea varieties in the world. The Darjeeling Himalayan Railway was constructed in the tea plantation zone. In eastern Bengal, the Sylhet and Chittagong hilly regions became hubs of tea production. Assam tea was produced in the northeastern part of the Bengal Presidency.