The Great Loop is an interconnected loop of waterways that enables transport throughout the entire Eastern US without traversing open ocean (with a few exceptions – see below!). There are many routes to take along the path, but the longest possible option is around 6,000 miles total.
Lake Balkhash: 50% fresh, 50% salty, 100% unique
Kazakhstan, one of the most sparsely populated countries in the world, is home to Lake Balkhash which is half freshwater and half saltwater.