Pheasant Island seen from France. javier hernández

Classified as a “condominium” (land shared under the joint ownership of two nations), it is both the smallest and oldest of its kind known to be in existence. Its 5,000 square meters belong to Spain for six months of the year and to France for the remaining six months. And today, it will peacefully transition to French hands, with that country managing it until the end of January 2018, before returning it to Spain again.

Though onlookers can see it from the shores of both countries – it is just 50 meters away from France and Spain – this small island is uninhabited and cannot be visited. Only members of the naval commands of San Sebastian and Bayonne can enter, as they are tasked with maintaining it while it’s under their respective jurisdictions.

Notably absent from Pheasant Island are pheasants themselves

“It requires little attention,” says Commander Rafael Preito, who was in charge of its administration until this past June. “People are very respectful, no one tries to trespass, even though sometimes the tide is so low you can almost walk across to it. We typically enter every five days to carry out routine maintenance,” he says.

There are no monuments on the island, except for a single monolith declaring its place in history. At this site, the Treaty of the Pyrenees was signed on November 7, 1659, ending a conflict initiated during the hugely destructive Thirty Years’ War. As the status of the landmass was previously undefined, one of the treaty’s clauses formally declared it a shared, neutral territory – symbolizing peace and cooperation between France and Spain. Since that time, several royal weddings and prisoner exchanges have taken place here.

The island has remained in relative peace for quite some time. The most recent disturbance occurred in 1974, when several members of the armed Basque-separatist group ETA, trying to cross the border, were caught near the island by the Civil Guard. The operation resulted in the death of an officer and one of the terrorists.

Perhaps the greatest danger the island has faced is its possible disappearance. When the condominium was first established, the island’s width had shrunk by half over the preceding two centuries because of erosion from the river. As a result, Spanish and French authorities agreed to do work to reinforce the island, and it paid off. Today, it is 215 by 38 meters in size, up from 80 by 5 meters at the time of the original agreement.

But notably absent from Pheasant Island are pheasants themselves, as French writer Victor Hugo complained during his visit to the site in 1843. “At most, there was a cow and three ducks, probably rented to take on the role of pheasants for visitors.” By some accounts, the original name was “Paussan Island.” By others, it was “Faisant Island.” Whatever it was, the current denomination is an adaptation to Spanish that is unreflective of reality. There are no pheasants here.