<P> Yellowstone National Park spans an area of 3,468.4 square miles ( 8,983 km ) , comprising lakes , canyons , rivers and mountain ranges . Yellowstone Lake is one of the largest high - elevation lakes in North America and is centered over the Yellowstone Caldera , the largest supervolcano on the continent . The caldera is considered an active volcano . It has erupted with tremendous force several times in the last two million years . Half of the world 's geothermal features are in Yellowstone , fueled by this ongoing volcanism . Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone . The park is the centerpiece of the Greater Yellowstone Ecosystem , the largest remaining nearly - intact ecosystem in the Earth 's northern temperate zone . In 1978 , Yellowstone was named a UNESCO World Heritage Site . </P>
<P> Yellowstone National Park spans an area of 3,468.4 square miles ( 8,983 km ) , comprising lakes , canyons , rivers and mountain ranges . Yellowstone Lake is one of the largest high - elevation lakes in North America and is centered over the Yellowstone Caldera , the largest supervolcano on the continent . The caldera is considered an active volcano . It has erupted with tremendous force several times in the last two million years . Half of the world 's geothermal features are in Yellowstone , fueled by this ongoing volcanism . Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone . The park is the centerpiece of the Greater Yellowstone Ecosystem , the largest remaining nearly - intact ecosystem in the Earth 's northern temperate zone . In 1978 , Yellowstone was named a UNESCO World Heritage Site . </P>
what formed the central portion of yellowstone national park about two million years ago
what formed the central portion of yellowstone national park about two million years ago
the Yellowstone Caldera , the largest supervolcano on the continent
the Yellowstone Caldera , the largest supervolcano on the continent