Which is the biggest island of the Galapagos Islands?

The Galapagos Islands are volcanic islands located off the west coast of South America. The individual islands are either a shield volcano characteristic of a single volcanic caldera located in the highest point of the island and tapering off to a flat coast. In the case of Isabela Island it was formed by several shield volcanoes merging together to form a single island.

Or several of the small islands were formed by a process known as geological uplift which are seen as flat table like islands.