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series of artesian springs, in Marion county, north-central Florida, U.S., about 5 miles (8 km) east of Ocala. The springs, which discharge an average of more than 73,500,000 cubic feet (2,080,000 cubic metres) per day, have the world's largest flow. The water maintains a constant temperature of 74 F (23 C). The source of the main spring is a cavern 65 feet (20 metres) long and 12 feet (3.6 metres) high. Most of the water discharged from the dozens of springs in the group is from the region's abundant rainfall, which drains into the porous limestone subsurface and later gushes to the surface, filtered to unusual clarity. The springs sustain a large variety of aquatic life. Remains of mastodons, manatees, and extinct elephants have also been found, including some in the Silver River (formed by the springs)
unincorporated community, Montgomery county, central Maryland, U.S., a northern residential suburb of Washington, D.C. It was once the site of the estate of journalist and politician Francis Preston Blair (1791-1876), whose son, Montgomery, served as postmaster general in Abraham Lincoln's cabinet. It derived its name from a local spring, the bottom of which sparkled with flakes of mica. Population growth occurred mainly after World War II. The headquarters of the National Association of the Deaf, the International Fabricare Institute, the Forest Glen Annex to the Walter Reed Army Medical Center, the Seventh-day Adventist World Headquarters, and the National Capital Trolley Museum are located there.