Tongking, or TONQUIN ("Eastern capital"), is properly the name of the town of Hanoi (q.v.), but it now denotes the part of Annam (q.v.) which extends from 18° N. Lat. to the borders of China. This district, which occupies the alluvial basin of 34,700 square miles, was in 1884 annexed by France. The most important product is rice.