Port of Merak (Port Code:IDMRK) is a seaport located in the Pulo Merak District of the city of Cilegon, Banten, on the northwestern tip of Java, Indonesia. It is a key transport link between Java and Sumatra and is a major service provider for the heavy passenger and commercial ferry traffic from Merak to Bakauheni across the Sunda Strait on the southern tip of Sumatra. Ferry services are operated by ASDP Indonesia Ferry. The port and district are named after the green peafowl, which once lived in the region, but now only lives in the nearby Ujung Kulon National Park. The port is connected to Jakarta via the Jakarta-Merak Toll Road and is also connected to the Bakauheni port which is located at the south of the Trans-Sumatran Highway.
A large thermal electric power plant is located close to Merak where coal barges handle large quantities of coal. A new LPG jetty handles liquid gases for distribution in Banten province, tankage has been built at Merak. Merak port also provides services for Indonesia's largest concentration of petrochemical facilities located nearby along the Merak peninsula. More than 40 petrochemical plants operate near the seaport, an increase from two in 1990. In 2007 Shell Oil announced plans to expand its Merak port operations with the construction of a $US52 million oil storage tank.