When farmers later transported this unaged corn whiskey, or moonshine, across the Ohio River for commerce, the spirit would age in its oak barrel containers, becoming infused with dark colour and complex flavour.

BBC: On and off Kentucky��s beaten Bourbon Trail

Kilbeggan 15 Year Old: Sitting on the banks of the Brosna River and opened in, the Old Kilbeggan Distillery was the oldest licensed whiskey distillery in the world (it no longer distills).

FORBES: Complete Guide to Irish Whiskey