Rafael Antonio Caldera Rodríguez (24 January 1916 – 24 December 2009) was a Venezuelan politician and academician who was the 46th and 51st president of Venezuela from 1969 to 1974 and again from 1994 to 1999, thus becoming the longest serving democratically elected politician to govern the country in the twentieth century.

The Yellowstone Caldera, sometimes referred to as the Yellowstone Supervolcano, is a volcanic caldera and supervolcano in Yellowstone National Park in the Western United States.

a large, mostly submerged caldera, located in the southern Aegean Sea, 120 kilometers north of Crete in Greece.

a volcanic caldera with a diameter of , making it the world's largest caldera.

a large caldera and extinct supervolcano in the San Juan volcanic field in the San Juan Mountains around the town of Creede in southwestern Colorado, United States.

a depression in eastern California that is adjacent to Mammoth Mountain.

The (or Jemez Caldera) a wide volcanic caldera in the Jemez Mountains of northern New Mexico.

a supervolcanic eruption remnant discovered in 2013 in Utah.

a gigantic volcanic caldera located on the southern end of Kyushu, Japan.