Cape Horn rainwater refers to the purest and freshest water that's naturally filtered through the angiosperm trees found in the Tierra del Fuego region of South America. If you're looking for synonyms for Cape Horn rainwater, some of the words you could use include pristine water, purest aqua, fresh water, untainted drops, or clean rainwater. These words are often used to refer to water that's been untouched by human influence and pollution. Drinking fresh and unpolluted water is essential to maintaining good health, and it's no wonder that Cape Horn rainwater is widely coveted for its purity.