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This region stretches over the Brahmaputra Valley, West Bengal (excluding the Darjeeling District) and eastern Bihar. The July temperature varies between 25°C and 35°C and that of January between 10°C and 25°C. The mean annual rainfall varies between 100 cm and 200 cm. The soil is alluvial and highly productive.
Rice is the main crop. Prom the same field tire farmers obtain three successive rice crops {Aman, Aus, and Boro} in a year. Jute, maize, pulses, and potato are the other important crops of the region.
Development of horticulture (banana, mango, and citrus fruits), pisciculture, poultry, and livestock can enhance the income of the cultivators substantially.