Isla Redonda, Mediterranean island in Murcia, Spain

Isla Redonda, also called Isla Rondella, is a volcanic island in the Mar Menor, south of La Manga, in the municipality of Cartagena. With 2.2 hectares it is the smallest island of the lagoon, round in shape and rising like a small hill between the Isla del Ciervo and the Isla del Sujeto, though farther toward the interior of the Mar Menor.

Isla Redonda is a submarine volcanic cone that emerged about 7 million years ago, during the Upper Miocene, like the other islands of the Mar Menor. It lies within the natural area Espacios abiertos e islas del Mar Menor, protected as a parque natural and a Zona de especial protección para las aves.

The island is also called Isla Rondella in Spanish, a name that refers to its circular shape. It lies within the protected natural area of Open Spaces and Islands of the Mar Menor, and its colony of little egrets and herons makes it a site of ornithological interest.

The island is visible from shore and can be found in regional travel guides and online maps. Best views are from the coastal paths and viewpoints along the nearby Murcia shoreline.

At 2.2 hectares, Isla Redonda is the smallest island in the Mar Menor, yet its circular, mound-like profile makes it stand out among the lagoon's islands. It lies between Isla del Ciervo and Isla del Sujeto, though farther toward the lagoon's interior. It is a nesting site for waterbirds, notably a colony of little egrets and herons.