Uniworld's Queen Isabel provides an up-close and unforgettable view of Portugal's Douro River Valley-a designated UNESCO World Heritage Site-renowned for its dramatic, rugged scenery and pristine waters. Named after Portugal's beloved queen, this boutique 116-passenger vessel is the most unique and stately ship on the Douro, a wonderful place to admire the region's steeply terraced hillside vineyards and charming wine estates.