National change twice a year!

France and Spain, owned by the island in the middle of the river, two countries on both sides of the river.

There is a place in this world where people's nationality is changed twice a year. I am surprised to hear it, do not you? Sanain Island is located in the Bidasso River in the Basky region on the border between Fans and Spain.
And there was such a situation there for 350 years.
Once a year Spain takes ownership of the island from France. After six months of re-ownership back to France. This rule was in force for three and a half hundred years. In 1659, mediators continued for three months to stop the ongoing war between the two countries. They reached the ceasefire. King Louis XIV of France married the daughter of King Philip IV of France to strengthen the relations between the two countries.
The River Vidasawa has passed through the baski suburbs. There is a border between France and Spain.
The bridge on this island has been increased in two countries. At one time, people could move effortlessly with the bridge connecting the two countries. The problem was only in the 1940s at the time of General Franco.
Currently no one lives on this island. But considering historic diversity and value it has become attractive to the tourists. It has been long since the agreement between the two countries on the island has survived. The four era has passed, the agreement that will take place in the fifth year.