<P> Extended systems of underwater caves, sinkholes and springs are found throughout the state and supply most of the water used by residents . The limestone is topped with sandy soils deposited as ancient beaches over millions of years as global sea levels rose and fell . During the last glacial period, lower sea levels and a drier climate revealed a much wider peninsula, largely savanna . The Everglades, a wide, slow - flowing river, encompasses the southern tip of the peninsula . </P> <P> While there are sinkholes in much of the state, modern sinkholes have tended to be in West - Central Florida . </P> <P> Florida is tied for last place (with North Dakota) as having the fewest earthquakes of any US state . Because Florida is not located near any tectonic plate boundaries, earthquakes are very rare, but not totally unknown . In January, 1879, a shock occurred near St. Augustine . There were reports of heavy shaking that knocked plaster from walls and articles from shelves . Similar effects were noted at Daytona Beach 50 miles (80 km) south . The tremor was felt as far south as Tampa and as far north as Savannah, Georgia . In January 1880, Cuba was the center of two strong earthquakes that sent severe shock waves through the city of Key West, Florida . (See List of earthquakes in Cuba) Another earthquake centered outside Florida was the 1886 Charleston earthquake . The shock was felt throughout northern Florida, ringing church bells at St. Augustine and severely jolting other towns along that section of Florida's east coast . Jacksonville residents felt many of the strong aftershocks that occurred in September, October, and November 1886 . As recently as 2006, a magnitude 6.0 earthquake centered about 260 miles (420 km) southwest of Tampa in the Gulf of Mexico sent shock waves through southwest and central Florida . The earthquake was too small to trigger a tsunami and no damage was reported . </P>

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