The Mekong Delta covers much of southernmost Vietnam. The vast wetland area can stretch for more than 15,000 square miles during flood season, with the southernmost plains almost completely covered by water during the rainy months. The delta is a treasure trove of aquatic and avian life, with some species found nowhere else in the world. This is one of the most heavily populated wetland areas on Earth. The Mekong’s residents often use the waterways as a stand-in for roads, traveling from place to place via boat. The relatively high population makes it easy to visit the Mekong Delta, with tours to more-natural areas available in the main population centers like Can Tho.