Manzanillo is a city as well as its surrounding municipality in the Mexican state of Colima. The city, located on the Pacific Ocean, contains Mexico's busiest port.Manzanillo is also a beach resort and, as the self-proclaimed "sailfish capital" of the world, hosts a yearly sailfish fishing tournament. The Revillagigedo Islands, off the west coast of Mexico in the Pacific Ocean, are part of the municipality. In 2004 the port of Manzanillo surpassed Veracruz as Mexico's largest port per volume of cargo.[citation needed] Port business experienced a significant surge during the USA's West Coast Lockout in Long Beach, California, in 2002. Manzanillo also hosts the most efficient port for tuna landings in Mexico. The city is also well known internationally for deep-sea fishing and a particular tonality during sunsets that gives the impression of a green ray (yet a lot of people certify they really saw it, mentioning "the green flash"). Manzanillo is a sister city of Flagstaff, Arizona, U.S.