The island's name, Marchena Island (

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Can ...

: ''Isla Marchena''), comes from the Spanish monk, Frey Antonio de Marchena. It has an area of 130 km² and a maximum altitude of 343 meters. The island is not set up for visitors, although the surrounding water is used by aquatic divers on organised tours. People generally see the island as they sail around the northern part of Isabela on the way to

Tower Island Tower Island is an Antarctic island long and high. It marks the north-east extent of Palmer Archipelago. It lies north-east of Trinity Island, separated by Gilbert Strait. Both islands are separated from the Davis Coast to the south by ...

. Marchena is Tower Island's nearest neighbor, about 45 miles due west. Like many of the Galápagos volcanos, Marchena has a

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...

. Marchena's caldera is roughly elliptical and measures , within the range of caldera sizes of the large western volcanoes. Marchena's caldera is unusual, however, in that it has been almost completely filled with young lavas, some of which has spilled over and down the sides. The oldest lava pools go back 500,000 years.

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* {{Galápagos Islands Islands of the Galápagos Islands Uninhabited islands of Ecuador Volcanoes of the Galápagos Islands Calderas of the Galápagos Islands Pleistocene shield volcanoes Active volcanoes

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