The islands belong in the group of Mikres Anatolikes Cyclades.
They comprise of Pano Koufonissi, or Koufonissi plain as it is the only inhabited island in the group, Kato Koufonissi, while Glaronissi and Keros complete the picture.
Pano and Kato Koufonissi are separated by a narrow strait, a mere 200 metres wide.

Geographically they are located southeast of Naxos and west of Amorgos.
Southwest of the Koufonissia is Schinoussa, and right after that is Iraklia.