Tamnavulin Oloroso Cask is a Speyside Single Malt firstly matured in American oak barrels and enhanced by a finish in special Oloroso Sherry casks. The perfect compliment to the sweet, mellow and smooth taste of Tamnavulin. Tamnavulin Distillery was opened in 1966 on the banks of the River Livet, deep in the heart of Speyside, the most celebrated whisky making region in Scotland.