[colorado tanker]

Looks like it would have to get closer to the 500 feet mark to close off the Gulf of Mexico, but I wouldn't at all be surprised if you're right, that it became a freshwater lake.

I notice on the map that Sundaland appears and the English Channel disappears. I understand some modern tankers barely clear the Channel bottom - it's pretty shallow. The Baltic also disappears, where there's some interesting archeology starting up. Japan also joins the mainland - making for some intriguing possibilities as to its ethnic history.

[blam]

Notice the Mediterranean was probably blocked (and the dessicated), the Red Sea probably evaporated away and the Persian Gulf is missing too.