The Denmark Strait cataract, the world’s largest underwater waterfall, is located between Iceland and Greenland. Plunging 11,500 feet from top to bottom, it plays a key role in the global ocean circulation system. The waterfall forms part of the thermohaline circulation, which helps regulate the Earth’s climate. Despite its immense size, it remains invisible from th…The Denmark Strait cataract, the world’s largest underwater waterfall, is located between Iceland and Greenland. Plunging 11,500 feet from top to bottom, it plays a key role in the global ocean circulation system. The waterfall forms part of the thermohaline circulation, which helps regulate the Earth’s climate. Despite its immense size, it remains invisible from th…