Strait of Gibraltar These "internal waves" continue to flow eastward and to refract around coastal features. They can sometimes be traced for as much as , and sometimes create interference patterns with refracted waves. Except for its far eastern end, the Strait lies within the territorial waters of Spain and Morocco. The United Kingdom claims around Gibraltar on the northern side of the Strait, putting part of it inside British territorial waters. As this is less than the maximum, it means, according to the British claim, that part of the Strait lies in international waters. The ownership of Gibraltar and its territorial waters
Lines of Contravallation of Gibraltar ruins of the fortifications, of which only a few fragmentary remains can be seen today. Following the Anglo-Dutch capture of Gibraltar in 1704 and the subsequent Twelfth Siege of Gibraltar, in which the Spanish and their French allies sought unsuccessfully to recover the territory, the Spanish built a permanent line of fortifications facing south across the isthmus. Construction began in November 1730 under the Marquis of Verboom with the intention that the lines would block any British invasion of Spanish territory mounted from Gibraltar, act as a starting point for any future Spanish operations against Gibraltar, and cut off access