FIGURE 1.1 Worldwide locations of methane hydrate occurrences show the location of sampled and inferred methane hydrate in oceanic sediment of outer continental margins and permafrost regions. Many of the recovered methane hydrate samples have been obtained during deep coring projects or seafloor sampling operations. Most of the inferred methane hydrate occurrences are marine sites at which bottom-simulating reflectors have been observed on available seismic profiles. The methane hydrate occurrences reviewed in this report have also been highlighted on this map. Numbers adjacent to abbreviated site locality names identify project or drilling legs. GMGS = Guangzhou Marine Geological Survey; IODP = Integrated Ocean Drilling Program; JIP = joint industry project (Department of Energy Methane Hydrate Program supported); METI = Ministry of International Trade and Industry of Japan; NGHP = National Gas Hydrate Program of India; ODP = Ocean Drilling Program; UBGH = Ulleung Basin Gas Hydrate. Modified from Keith Kvenvolden and others from the U.S. Geological Survey.