The Port of Colombo (known as Port of Kolomtota during the early 14th Century Kotte Kingdom) is the largest and busiest port in Sri Lanka as well as in South Asia. Located in Colombo, on the southwestern shores on the Kelani River, it serves as an important terminal in Asia due to its strategic location in the Indian Ocean. During the 1980s, the port underwent rapid modernization with the installation of Cranes, Gantries and other modern-day terminal requirements. Currently with a capacity of 4.1 million TEUs and a dredged depth of over 15 m (49 ft), the Colombo Harbour is one of the busiest ports in the world, and ranks among the top 35 ports. It is also one of the biggest artificial harbours in the world handling most of the country's foreign trade. It has an annual cargo tonnage of 30.9 million tons. The port is also the naval base for Sri Lanka Navy Western Fleet under the Commander Western Naval Area (COMWEST).