Redonda Rock

Redonda Rock (Roca Redonda, "Round Rock") is a flat-topped, steep-sided islet located roughly 25 km northwest of the island of Isabela in Ecuador's Galápagos Islands. Redonda measures 100 m long and 50 m wide with a maximum elevation of 67 m. Its isolation and inaccessibility coupled with its rocky cliffs riddled with crevices and crossed by ledges has made Redonda a haven for nesting seabirds.

This small volcanic island is the remains of a large shield volcano that has vastly eroded away below sea level. Potassium–argon dating of Redonda indicates that the islet is at least 53,000 years old. However, it remains unknown when the last eruption occurred from the shield volcano. Several shallow submarine fumaroles exist around the island and may indicate that the volcano is still active.