Hidden among the ravines and steep slopes of southeastern Evia, the small mountain village of Antia overlooks a labyrinthine landscape that descends toward the Aegean. There, on the foothills of Mount Ochi, lies a community that has attracted global interest thanks to a tradition found in very few places on earth.

In an earlier feature, the BBC chose to present Antia, emphasizing that it is a unique place where the locals have developed a special way of communicating: instead of speaking, they use… whistles. As a visitor ascends from Karystos to the village along a narrow, winding road through an almost mythical terrain, the sounds echoing on the hillsides resemble ancient calls.

The whistled language used in Antia —known as “sfyria”— is one of the rarest forms of communication on the planet. It relies entirely on whistles that imitate bird sounds and allow full conversations over very long distances. Each sound corresponds to a letter of the alphabet, and the combination of tones forms words and meaning.

For centuries, only the shepherds and farmers of Antia knew and passed down this skill from generation to generation. However, the dramatic decline in population and the aging of residents have led to the gradual extinction of the tradition. As older villagers can no longer produce clear whistles, fewer and fewer people today can “speak” the language.

The exact origins of this unusual language remain unknown. Some villagers believe it comes from Persian soldiers who took refuge on Mount Ochi 2,500 years ago, while others claim it developed during Byzantine times as a secret warning system for invasions or dangers. Other theories link it to ancient Athens, where “whistlers” were stationed on mountaintops as lookouts, or to Dorians, or even to inhabitants of Ainos who were relocated to the area in the 15th century.

The discovery of “sfyria” by the outside world happened by accident in 1969. When rescue crews were searching for a pilot who had crashed on Mount Ochi, they heard strange sounds in the ravines and realized that shepherds were communicating over long distances through whistles.

According to linguist Dimitra Hengen, “sfyria” is essentially a whistled version of Greek, where each letter and syllable is converted into a different frequency. Whistled transmission has the advantage of traveling much farther than the human voice — it can reach up to 4 kilometers, ten times farther than a shouted call.

For decades, the language was an indispensable tool for survival in such an isolated place. “Roads, water, and electricity came here only 30 years ago,” said shepherd Giannis Tsipas. “Until 1997, Koula had the only telephone in Antia…”

Ἡ σφυριχτὴ γλῶσσα τῆς Ἀντιᾶς

“Sfyria” served not only practical purposes; it also played a role in human relationships. As resident Maria Kefala recounts, her parents met thanks to a snow-covered call in the night, when her father whistled to her mother to seek shelter and warmth in a cave.

Today, around 70 whistled languages exist worldwide, mostly in mountainous, isolated regions. Nevertheless, the “sfyria” of Antia is considered the oldest and most structured — and at the same time, the most endangered. As UNESCO notes, there is no other language in Europe, whistled or not, spoken by so few people.