[3] Koufonisia includes three main islands: Geographically, they are located on the south-southeast side of Naxos and on the west-northwest of Amorgos and belong to the archipelago of the Lesser East Cyclades.

Uninhabited Keros is a protected archaeological site from which many ancient Cycladic art pieces were excavated in the 20th century.

According to the second version, which is supported by Manesis, this name was chosen because of the large number of caves and sediments that are found on the island.

Excavations in Epano Mili brought to light evidence that dates back to the first years of Cycladic civilization.

During the Axis occupation of World War II (1941–1945), the islands' residents faced difficult times.

Residents were going to the other Greek islands and the mainland by small boats (caiques) and by a ship that was going to Heraclia every eight days.

The most distinctive sight of the island is the small church of Panagia that is built on a jetty, on top of ancient ruins.

[citation needed] The white windmill on the east side of the port can be seen by visitors when they arrive on the island.

According to the residents of Koufonisi, the contour of the deserted island at night resembles a female, prostrated Cycladic statuette.

The church of Virgin Mary is one of the most important sights on Koufonisi, whereas in Keros apart from the archaeological findings, one can enjoy the sunrise.

During the epitaph's procession the sky is lit by fireworks and events are organized on the main beach of the island.