While Europe's waterways are typically the first thought in river cruising, more far-flung locations in Asia, Africa, and South America are opening up to cruisers who want to experience something completely different. And since the line handles the logistics (transfers, guided shore excursions), these voyages make it easy to explore destinations where it's not as easy to get from point A to point B. Another bonus: far fewer ships travel these routes, so you won't be joining the masses at every port. Here are seven exotic river itineraries to stoke your sense of adventure.