<Li> and the difference between (range of) their highest points and lowest points . </Li> <P> The following list is a comparison of elevation absolutes in the United States . Data include interval measures of highest and lowest elevation for all 50 states, the District of Columbia, and U.S. territories . </P> <P> Which state or territory is "highest" and "lowest" is determined by the definition of "high" and "low". For instance, Alaska could be regarded as the highest state because Denali, at 20,310 feet (6,190.5 m), is the highest point in the United States . However, Colorado, with the highest mean elevation of any state as well as the highest low point, could also be considered a candidate for "highest state". Determining which state is "lowest" is equally problematic . California contains the Badwater Basin in Death Valley, at 279 feet (85 m) below sea level, the lowest point in the United States; while Florida has the lowest high point, and Delaware has the lowest mean elevation . Florida is also the flattest state, with the smallest difference between its highest and lowest points . </P> <P> The list of highest points in each state is important to the sport of highpointing, where enthusiasts attempt to visit the highest point in each of the contiguous 48 states, or in all 50 states, or in all 50 states plus the District of Columbia and the territories . As of 2006, 155 people had reached all fifty state highpoints . Roughly 200--300 people attend the Highpointers Club convention each year . </P>

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