Title: Gulf of Mexico
Content:  oval in shape and is approximately 810 nmi wide. Its floor consists of sedimentary rocks and recent sediments. It is connected to part of the Atlantic Ocean through the Florida Straits between the U.S. and Cuba, and with the Caribbean Sea via the Yucatán Channel between Mexico and Cuba. Because of its narrow connection to the Atlantic Ocean, the Gulf experiences very small tidal ranges. The size of the Gulf basin is approximately 1.6 million km2 (615,000 sq mi). Almost half of the basin consists of shallow continental-shelf waters. The volume of water in the basin is roughly 642e15 USgal (642e15 USgal). The Gulf of Mexico is one of the most important offshore petroleum-production regions in the world, making up one-sixth of the United States' total production.
Title: Gulf of Mexico
Content:   The Gulf of Mexico's eastern, northern, and northwestern shores lie along the US states of Florida, Alabama, Mississippi, Louisiana, and Texas. The US portion of the Gulf coastline spans 1680 mi, receiving water from 33 major rivers that drain 31 states. The Gulf's southwestern and southern shores lie along the Mexican states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatán, and the northernmost tip of Quintana Roo. The Mexican portion of the Gulf coastline spans 1,743 miles (2,805 km). On its southeast quadrant, the Gulf is bordered by Cuba. It supports major American, Mexican and Cuban fishing industries. The outer margins of the wide continental shelves of Yucatán and Florida receive 
Title: Gulf of Mexico
Content:   The Gulf of Mexico (Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States; on the southwest and south by the Mexican states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan, and Quintana Roo; and on the southeast by Cuba. The U.S. states of Texas, Louisiana, Mississippi, Alabama, and Florida, which border the Gulf on the north, are often referred to as the "Third Coast" of the United States (in addition to its Atlantic and Pacific coasts). The Gulf of Mexico took shape approximately 300 million years ago as a result of plate tectonics. The Gulf of Mexico basin is 
Title: Offshore oil and gas in the Gulf of Mexico (United States)
Content:  Offshore oil and gas in the Gulf of Mexico is a major source of oil and natural gas in the United States. The western and central Gulf of Mexico, which includes offshore Texas, Louisiana, Mississippi, and Alabama, is one of the major petroleum-producing areas of the United States. Oil production from US federal waters in the Gulf of Mexico reached an all-time annual high of 1.65 million barrels per day in 2017. Oil production is expected to continue the upward trend in 2018 and 2019, based on ten new oil fields which are planned to start production in those years. According to the Energy Information Administration, "Gulf of Mexico federal offshore oil production accounts for 17% of total U.S. crude oil production and federal offshore natural gas production in the Gulf accounts for 5% of total U.S. dry production." Major fields include Eugene Island block 330 oil field, Atlantis Oil Field, and the Tiber oilfield (discovered 2009). Notable oil platforms include Baldpate, Bullwinkle, Mad Dog, Magnolia, Mars, Petronius, and Thunder Horse.[BP & Halliburton]]> Notable individual wells include Jack 2 and Knotty Head.
Title: Gulf of Mexico
Content:  On April 20, 2010, the Deepwater Horizon oil platform, located in the Mississippi Canyon about 40 mi off the Louisiana coast, suffered a catastrophic explosion; it sank a day and a half later. It was in the process of being sealed with cement for temporary abandonment, to avoid environmental problems. Although initial reports indicated that relatively little oil had leaked, by April 24, it was claimed by BP that approximately 1000 oilbbl of oil per day were issuing from the wellhead, about 1 mi below the surface on the ocean floor. On April 29, the U.S. government revealed that approximately 5000 oilbbl per day, five times the original estimate, were pouring into the Gulf from the wellhead. The resulting oil slick quickly expanded to cover hundreds of square miles of ocean surface, posing a serious threat to marine life and adjacent coastal wetlands and to the livelihoods of 
Title: Oil production plant
Content:  feet (9.14 m) long. Vessels on Gulf of Mexico deepwater installations are 12 to 14 feet (3.66 to 4.27 m) diameter and 60 to 70 feet (4.27 to 21.34 m) long. The number of stages of separation depends on:  First stage separators in the Gulf of Mexico typically operate at 1500 to 1800 psi (103.4 to 124.1 bar), they operate as 2-phase liquid and vapour separators with a liquid residence time of 1 to 2 minutes. Produced water is removed in the low pressure (LP) 3-phase separator. This operates at 150 –250 psi (10.3 – 17.2 bar). In the 
Title: Gulf killifish
Content:  The Gulf killifish plays an important role in scientific research concerning the disaster resulting from the Deepwater Horizon oil spill. The spill occurred in April 2010 and resulted in an estimated 53,000 barrels per day of Macondo-252 crude oil being spilled from the well before it was capped in September 2010. The spill affected the Gulf coast area about a year and was finally determined to be maintained in October 2011. Several coastal reconstruction projects are still underway to try to restore the ecosystems of the Gulf.
Title: Gulf of Mexico
Content:   The major environmental threats to the Gulf are agricultural runoff and oil drilling. There are frequent "red tide" algae blooms that kill fish and marine mammals and cause respiratory problems in humans and some domestic animals when the blooms reach close to shore. This has especially been plaguing the southwest and southern Florida coast, from the Florida Keys to north of Pasco County, Florida. In 1973 the United States Environmental Protection Agency prohibited the dumping of undiluted chemical waste by manufacturing interests into the Gulf and the military confessed to similar behavior in waters off Horn Island. The Gulf contains a hypoxic dead zone that runs east-west along the Texas-Louisiana coastline. In July 2008, researchers reported that between 1985 and 2008, the area roughly doubled in size. It was 8,776 sqmi in 2017, the largest ever recorded. Poor agricultural practices in the 
Title: Ixtoc I oil spill
Content:  The oil that was lost during the blow-out polluted a considerable part of the offshore region in the Gulf of Mexico as well as much of the coastal zone, which consists primarily of sandy beaches and barrier islands often enclosing extensive shallow lagoons. The oil on Mexican beaches in early September was calculated to be about 6000 metric tons. Based on reports from various groups and individuals, five times that figure is thought to represent a fair estimate of what had landed on Mexican beaches. Investigations along the Texas coast show that approximately 4000 metric tons of oil or less than 1 percent was deposited there. The rest of the oil, 
Title: Offshore oil and gas in the Gulf of Mexico (United States)
Content:  The Deepwater Horizon oil spill (also referred to as the BP oil spill, the BP oil disaster, the Gulf of Mexico oil spill, and the Macondo blowout) began on April 20, 2010, in the Gulf of Mexico on the BP-operated Macondo Prospect. Killing eleven people,   it is considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8% to 31% larger in volume than the previous largest, the Ixtoc I oil spill.

Question: how many gallons of water in the gulf of mexico?
Answer: 660 quadrillion US gallons.