Current environmental issues are inadequate supplies of potable water; pollution of Majuro lagoon from household waste and discharges from fishing vessels.

Maritime claims: territorial sea: 12 nautical miles contiguous zone: 24 nm exclusive economic zone: 200 nm Elevation extremes: lowest point: Pacific Ocean 0 meters highest point: unnamed location on Likiep Atoll 10 meters (33 ft) above sea level Land use: arable land: 11.11% permanent crops: 44.44% other: 44.44% (2011) Environment - international agreements: party to: Biodiversity, Climate Change, Climate Change-Kyoto Protocol, Desertification, Hazardous Wastes, Law of the Sea, Ozone Layer Protection, Ship Pollution, Wetlands, Whaling Bikini and Enewetak are former US nuclear test sites; Kwajalein, the famous World War II battleground, is now used as a US missile test range; the island city of Ebeye is the second largest settlement in the Marshall Islands, after the capital of Majuro, and one of the most densely populated locations in the Pacific.

[3] Due to their low elevation, the Marshall Islands are threatened by the potential effects of sea level rise.

[4] According to the President of Nauru, the Marshall Islands are the most endangered nation on Earth due to flooding from climate change.

[5] A study by the University of Plymouth found that the tides move sediment to create higher elevation, which may keep the islands habitable.