Rainy Lake is the largest lake in Voyageurs National Park. This 73-mile long body of clear fresh water holds countless tasty Walleyes, trophy Northern Pike, the fighting Smallmouth Bass and an excellent population of slab Crappies. Whether you sw im, fish, sunbathe, relax, take photos, watch wildlife, visit the hiking trails, or tour the historic and natural sights of the park, houseboating is a great way to experience Rainy Lake.