"On December 16, 1977, the Governments of the United States of America and the Republic of Cuba signed an agreement delimiting a maritime boundary in the Straits of Florida and eastern Gulf of Mexico. The parties agreed to provisional application of the agreement, effective January 1, 1978, pending permanent entry into force of the agreement following the exchange of instruments of ratification. To date, this exchange has not occurred. Subsequent to the signing of this agreement Notes have been exchanged on six occasions (every two years) extending the provisional application of the agreement. The latest agreement occurred December 26, 1989. The text of the maritime boundary agreement is reproduced at Annex 1 of this report; a copy of the most recent exchange of notes extending the provisional application of the agreement is reprinted at Annex 2. [...] The 1977 negotiations leading to the maritime boundary agreement were one of the first formal and direct discussions the United States and Cuba held for many years. Each country had, in 1977, extended its maritime jurisdiction to 200 miles, Cuba claiming an exclusive economic zone, the United States claiming an exclusive fishing zone. Since the two countries are less than 400 miles apart there exists an area in the southern portion of the Straits of Florida and eastern Gulf of Mexico where their respective claims overlap."
United States Department of State: http://www.state.gov
Limits in the Seas No.110