Corvo Island, Azores This isolated and picturesque 6.5 km² island is a true hidden gem, offering an easygoing and authentic experience. Corvo's main attraction is the Caldeir?o, a lake inside an impressive volcanic crater, known as the Black Lake, or Lagoa Negra in Portuguese.

While satellite technology like Google Earth has mapped every square inch of the planet, "hidden" islands still exist in the sense of being undiscovered by tourism or legally restricted. For example, North Sentinel Island in the Andamans remains "hidden" from modern society due to a strictly enforced exclusion zone to protect the uncontacted Sentinelese tribe. In the South Pacific and the Raja Ampat archipelago of Indonesia, there are hundreds of unnamed limestone "karst" islands that remain uninhabited and virtually unvisited by anyone other than local fishermen. Furthermore, "ephemeral islands" occasionally appear due to underwater volcanic activity; in late 2024 and 2025, new landmasses were observed forming in the Home Reef region of Tonga. These islands are "hidden" because they are often not yet on official maritime charts and may disappear back into the sea within a few months.