We call it the Third Coast.
http://www.wmich.edu/thirdcoast/

Chicago calls it the Third Coast
http://www.thirdcoastfestival.org/

Some call it the Fourth Coast, so as not to piss off Texas an' all.
http:// http://www.glerl.noaa.gov/pr/about/history.html

U of W in Madison, Wisconsin also calls Lake Michigan's shore a coast.
http://www.ies.wisc.edu/research/wrm98/

As does the Federal Government of the U.S. of A.
http://tis.eh.doe.gov/oepa/law_sum/CZMA.HTM

How'm I doin' on the nit pickin', Faldage? This bein' my first try an' all.