Sedlo Seamount is an isolated seamount and underwater volcano located in the Northeast Atlantic, 180 mi (290 km) northeast of Graciosa Island. It has an elongate structure, roughly 75 by 30 km (47 by 19 mi). The summit is flat with three peaks. Sedlo Seamount sits on the ocean floor 3,000 m (9,843 ft) deep, and rises to within 660 m (2,165 ft) of the surface. Sedlo seamount has a tablemount structure, indicating that the peak of the seamount had once been above the water, but has since been ground down by persistent erosion to its current height.