Oktonia is a hillside village found in the east-central area of Euboea Island, belonging to the municipality of Kymi-Aliveri, Greece.

According to tradition, one night during a festive gathering, when the watchtowers were unattended, pirates landed from the sea of Aili where their ships were moored.

After some time, the mother and her daughters returned to the area but settled in a densely forested ravine at the foot of the mountain for protection from the pirates.

Around AD 1420, a village was founded and named Oktonees and later Oktonia (okto is the Greek for eight), for the eight young girls (nees) who escaped the pirates and first settled it.

Today, from these monastery complexes only the churches survive: St. George at Koutsouro, the Taxiarches (Archangels) at Kotsikia, the Presentation of the Virgin at Papavlassa, and St. Demetrios of the Waterfall.

Of these churches, St. Demetrios of the Waterfall is most noteworthy because the monastery played a significant role in the years leading up to the revolutionary struggle of 1821.

The mountainous terrain favored the resistance and, because of its struggle against the Ottomans, Oktonia experienced battles, a siege on the castle (Kastro), torture and massacres.

Individually and collectively, they host a number of cultural, educational, recreational and sporting events, without abandoning the village traditions.

[2] Below the Kallimani Mountain, which is still bare from the fires during Ottoman rule, the village lies amidst dense forest at an elevation of 400 meters.

Oktonia overlooks the hill of Oksilithos, the plain, and neighboring villages and offers a splendid view of the Aegean Sea.

Oktonia has a great deal of arable land and plenty of water, making it ideal for the cultivation of agricultural products.

The monastery, which was located on the site, was a spiritual center inspiring freedom-fighters for the 1821 Revolution and also supplying the Greek Revolutionary ships that were in the sea of Markourio.

The church interior is completely covered with extraordinary post-Byzantine paintings (1600), which depict a wide variety of religious themes in original, colorful compositions.

During the years leading up to the Revolution of 1821, the people of Oktonia took refuge in these fortresses against the attacks of the Turks who were under the leadership of the Pasha of Karistos, Ontabassin.

The women and children fled to other areas, the aged and the weak were slaughtered and the fighters escaped to the mountains in order to organize their subsequent revolutionary actions.

St. George at Koutsouro, the Taxiaches (Archangels) at Kotsikia, the Presentation of the Virgin at Papavlassa and St. John the Theologian at Karvouni are noteworthy churches in the area.

Along the ten kilometer sea coast of Oktonia are the beaches of Mourteri, Agios Mercurios, Bournias, Graves, Limionari, Aili and Kalami.