Location of Dyo AderfiaPosition:South of Alonissos.

Area: 2 square kilometres.

Highest Point: 178 meters & 154 meters

Southernly from Alonissos, in distance of 5,8 naut. miles fromPatitiri are located the rocky islands with the name Dio Aderfia (means Two Brothers) that are separated from each other from a narrow band of sea.

Kyra Panayia(ancientAlonissos)

Location of KyraPanayia island within the NMPANS

Position: North-east of Alonnisos (N39°19.524' E24°05.414' -Monastery)
Area: 25 square kilometres.

Highest Point: 299 metres.

With an area of 25 square kilometres Kyra Panayia is the largest of the desert islands.

Location of Piperi islandLocation: East of Kyra Panayia and Yioura.

Area: 7 square kilometres

Highest Point: 352m.

The island of Piperi and the sea surrounding it form the kernel of the National Marine Park. At the same time it is the most inaccessible island as it has no protected bay for the approach of a caïque. Steep rocks descend vertically into the sea on all sides. This rocky island has an area of 7 square kilometres and its high points are between 274 and 352 metres. There are clumps of pine and isolated oaks.