Fort Luis is located in the French part of the island in the city of Marigot. St. Maarten is the smallest Island in the world to be shared by two sovereign governments-namely the Dutch and French. The Dutch side, with Philipsburg as its capital occupies the southern 17 square miles of this 37-square-mile island; St. Martin, a French dependency, occupies the northern half. The dual nationality adds variety to this most unique of island gems in the Caribbean Sea. Both Dutch St. Maarten and French St. Martin have maintained a peaceful coexistence for over 350 years, the longest of any two bordering nations. The two territories have enjoyed harmonious relations through their history and have shared the prosperity of many years without dispute. The Treaty of Concordia executed on March 23rd 1648 established this coexistence and has the unique distinction of being the oldest Treaty still in force today.