Gulf of Mexico
The Gulf of Mexico was a gulf on Earth. This was an extension of the Atlantic Ocean, with the United States of America, Cuba, and Mexico having coastlines on this Gulf.

In an alternate 1944, the gulf itself was labeled on the map of the United States of America that showed the progress of the Nazi's campaign on the North American continent. It was described there as Golf von Mexico (Gulf of Mexico). ()

In the 21st century, Lieutenant John Kelly would tease Rose Kumagawa about her claim of seening an UFO over the Gulf. He would tell her it was a meteor or a piece of the space station Mir. In one of the last logs of the Ares IV, Kelly mentioned that he had a remembrance of this. ()

In the 22nd century, the future Commander Charles Tucker III would drive his first car out to Chatkin Point. He would park at the shoreline, feel the ocean breeze coming off the Gulf, and spend time with his girlfriend staring at the moon. ()
 
Tucker would often go swimming in the Gulf, sometimes inviting a girlfriend named . He would often tell T'Pol of his desire to show her some of the beaches of the Gulf. ()

In  2153, the strait between Florida and Cuba, which connected the Gulf to the Atlantic, was attacked during the Xindi incident. ()

A 21st century-era political map of Earth was stored in the 's library computer in 2254. The location of the Gulf of Mexico was labeled on this map. This map was among the materials viewed by the Talosians when they scanned the Enterprise computer. ()

While discussing the prospect of leaving  to live among a group of Humans settled in the Delta Quadrant, Chakotay reminded himself that he could never do it knowing that he would be giving up such prospects as seeing the sunrise over the Arizona desert, or swimming in the Gulf of Mexico on a summer's day. ()

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de: Golf von Mexiko
fr:Golfe du Mexique
nl:Golf van Mexico
Earth bodies of water