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Weird Fact #242

This island switches countries every six months

Pheasant Island in the Bidasoa River belongs to Spain from February 1 to July 31 and to France from August 1 to January 31.

October 23, 2026 · 2 min read · 3 sources

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Pheasant Island in the Bidasoa River belongs to Spain from February 1 to July ___ and to France from August 1 to January 31.

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Somewhere between France and Spain there’s an island that can’t decide where it belongs. So it doesn’t. Pheasant Island in the Bidasoa River is Spanish for half the year and French for the other half.

Six months here, six months there

The schedule is fixed: Spain is in charge from February 1 to July 31, France from August 1 to January 31. The island is tiny, a bit over 200 meters long and about 40 meters wide, mostly covered in trees, and nobody lives there. It sits between Irun on the Spanish bank and Hendaye on the French one.

According to The Connexion, the island is run by regional marine captains from both sides, who carry the title of viceroy. Amusing Planet describes the handover as a short ceremony in which officials from both countries pass over documents. It also quotes The New York Times, which compared the island to the ball in an extremely slow game of ping-pong between France and Spain.

A peace treaty on a tiny island

Why all this? In 1659, France and Spain met on the island to end a war that had started in 1635. The Connexion counts 24 meetings there between August 13 and November 7, 1659, the day the Treaty of the Pyrenees was signed. The deal came with a royal marriage: Louis XIV was to marry a daughter of Spain’s King Philip IV. According to Amusing Planet, Louis met his future wife Maria Theresa on the island.

According to Amusing Planet, the treaty turned the island into a shared territory, a condominium, and Islands.com calls it the smallest one in the world. A stone monument on the island honors the treaty, with its inscription in Spanish on the side facing Spain and in French on the side facing France.

Don’t plan a picnic, though. The island is closed to the public. At least it’s close: Islands.com puts it just 10 meters from the Spanish bank.

Bonus fact: According to The Connexion, the Covid years broke the rhythm, and Spain kept the island for two years in a row.

So twice a year, an island full of trees quietly changes its passport.

The evidence

  1. 1The Connexion: The tiny Basque island that is both French and Spanish
  2. 2Amusing Planet: Pheasant Island: The Island That Changes Sovereignty Every Six Months
  3. 3Islands.com: Tucked Between Spain And France Is A Tiny Uninhabited Island That Changes Nationalities Throughout The Year

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🎃 The golden pumpkin! Here is your secret Halloween fact:

The first jack-o’-lanterns were turnips. In Ireland and other Celtic regions in the 19th and early 20th centuries, people carved faces into turnips, sometimes potatoes or beets, and put a candle inside. It was meant to keep away the restless spirit “Stingy Jack”, who was barred from both heaven and hell. The National Museum of Ireland in County Mayo still keeps a plaster cast of a carved turnip from Donegal with “a pinched angry face”.

Source: Smithsonian Magazine