Yellowstone National Park is located primarily in Wyoming but also extends into Montana and Idaho, covering 2,219,789 acres. The Yellowstone Caldera is the largest volcanic system in North America, formed by exceptionally large eruptions, with an underground magma chamber estimated to be 60 km long, 29 km wide and 5-12 km deep. The caldera is considered an active supervolcano that has erupted powerfully several times over the last two million years. Features within the park include the Yellowstone Falls, with Upper and Lower Falls on the Yellowstone River, plunging into the Grand Canyon of the Yellowstone. Old Faithful Geyser erupts approximately every 91 minutes and is the most famous gey

2.  World's First National
Park
 2,219,789 acres
 Based in 1872
 located primarily in
the U.S. state of
Wyoming, although it
also extends into
Montana and Idaho

4.  The Yellowstone Caldera is the largest
volcanic system in North America. It has been
termed a "supervolcano" because the caldera
was formed by exceptionally large explosive
eruptions. The magma chamber that lies
under Yellowstone is estimated to be a single
connected chamber, about 37 miles (60 km)
long, 18 miles (29 km) wide, and 3 to 7 miles
(5 to 12 km) deep

5. The caldera is
considered an
active volcano. It
has erupted with
tremendous force
several times in the
last two million
years. Lava flows
and rocks from
volcanic eruptions
cover most of the
land area of
Yellowstone

7. Calderas - a
large volcanic
crater,
typically one
formed by a
major
eruption
leading to
the collapse
of the mouth
of the
volcano.

8.  Falls consist of two major waterfalls on the
Yellowstone River. As the Yellowstone river
flows north from Yellowstone Lake, it leaves
the Hayden Valley and plunges first over
Upper Yellowstone Falls and then a quarter
mile (400 m) downstream over Lower
Yellowstone Falls, at which point it then
enters the Grand Canyon of the Yellowstone,
which is up to 1,000 feet (304 m) deep.

11.  The most famous geyser in the park, and
perhaps the world, is Old Faithful Geyser.
 A study that was completed in 2011 found
that at least 1283 geysers have erupted in
Yellowstone.
 Of these, an average of 465 are active in a
given year.

13. Old Faithful Geyser erupts approximately every 91 minutes.

14.  Yellowstone Lake is the largest lake in north
america.
 The lake is 2,357 m above sea level and covers
350 km2 with 180 km of shoreline. While the
average depth of the lake is 42 m, its
greatest depth is at least 120 m.