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Sivasagar, town, eastern Assam state, northeastern India. Sivasagar lies on the Dikhu River, a tributary of the Brahmaputra River, about 30 miles (50 km) northeast of Jorhat. The Tai-speaking Ahom people came to the area from Yunnan province, China, in the 13th century. Sivasagar was the capital of the Ahom kingdom in the 18th century, when the town was called Rangpur; several temples remain from that period. The town is now a tea-processing centre on...