For a purely Virginia blend, Mac Baren Virginia #1-- is the only Mac Baren blend that is 100% Virginia leaf. I have recently sampled, and taken a real liking to Altadis' Bulk - Virginia Slices 507C, which is an economical generic Danish style Va. flake.
The only tobacco I can think of that is only grown and processed in only one country (other than certain strains of cigar leaf) is Perique, which is grown in Louisiana (St. James Perique) and Tennessee (Acadian Perique) and processed strictly in St. James Parish, Louisiana.
Turkish tobacco, or Oriental tobacco, is a highly aromatic, small-leafed variety of tobacco which is sun-cured. Historically, it was cultivated primarily in Thrace and Macedonia, now divided among Bulgaria, Greece, the Republic of Macedonia and Turkey, but it is now also grown on the Black Sea coast of Turkey, in Egypt, in South Africa and elsewhere.