The Anglo-Ottoman Convention of 1913, also known as the "Blue Line", was an agreement between the Sublime Porte of the Ottoman Empire and the Government of the United Kingdom which defined the limits of Ottoman jurisdiction in the area of the Persian Gulf with respect to Kuwait, Qatar, Bahrain, and the Shatt al-Arab. It was signed on 29 July 1913, but never ratified, the long-lasting impact of the agreement was that of the status of Kuwait; the basis for both formal independence and the frontiers of modern Kuwait were established.