I own 83 acres in Georgia and live in Florida. Does anyone know the IRS tax ramifications if I sell the land?

You need to know the value of the land at the time you inherited it.

Any gain since then is taxable, at most 15%. for federal purposes.

Since the land is located in GA, you would also owe capital gains taxes there.

The land is valued at its value when you inherited. If you sell for more, you have a capital gain, if less, capital loss. Hard, but not impossible, to get a mortgage on vacant land, easier for specific purpose, clearing, developing, building.