15) Bonito Mato Grosso do Sul, Brazil
This delightful location has some of the clearest waters in the world, and is regarded as the top places to go if you want to see ecosystems operating at their best. The exceptionally pristine waters are largely the result of limestones that filter and purify the contents of the streams and rivers. The result is you will be able to enjoy waters that are so clear you can see as far as 30m (98+ft). There are tours and experienced scuba guides who can direct underwater excursions. You are best advised to visit during the rainy season, which spans December to March, when the plant and animal life are thriving and the waterfalls are bursting. The rainy season is also when the spectacular rivers in Bonito are at their highest. You will be hard-pressed to find anything more stunning than the underwater views you’ll experience as you snorkel in the Rio de Prata.