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There are two of them. One would be the Florida peninsula in the United States; the other would be the Yucatan peninsula in Mexico.
See related questions below for details on the Yucatan peninsula.
The Yucatan Channel is the strip of water provides a passageway between Mexico and Cuba.
Yucatan Mexico just 2 hours west of Cancun, between Cancun and Merida.
The Yucatan peninsula.
Which Mexican State is not on the Gulf of Mexico?