Location of Greenwich Island in the South Shetland Islands.
Maldonado Base, also Pedro Vicente Maldonado Base, is the Ecuadorian Antarctic research base situated at Guayaquil Bay, Greenwich Island in the South Shetland Islands, Antarctica opened in 1990. The area was visited by early 19th century sealers operating from nearby Clothier Harbour.
The base is named after the Spanish-American astronomer, topographer, and geographer Pedro Vicente Maldonado (1704–1748) born in Riobamba, present Ecuador.
The base is located at 62°26′56.6″S 59°44′29″W / 62.449056°S 59.74139°WCoordinates: 62°26′56.6″S 59°44′29″W / 62.449056°S 59.74139°W which is 560 m south-southwest of Orión Point, 990 m southwest of Spark Point, 1.16 km north-northwest of Serrano Point and 2.56 km east-southeast of Agüedo Point (detailed Ecuadorian mapping in 2007, Bulgarian mapping in 2005 and 2009).