Redwood City, California, the seat of San Mateo County. It is 23 miles (37 km) southeast of downtown San Francisco. Redwood City's harbor is connected by a channel with San Francisco Bay, about three miles (5 km) to the east. The harbor is a deep-water port. Electronic equipment, food products, and lumber are produced here. The growing and shipping of flowers, especially chrysanthemums, is an important industry. Redwood City was founded about 1856. It was a redwood lumbering center in the 19th century.