He found it in on the 21st of October 1515
The passage from the Atlantic to the Pacific at the south tip of South America is called the Strait of Magellan.
Ferdindand Magellan....
The Strait of Magellan
The passage found near 50 degrees South of Strait of Magellan is named the Strait of All Saints
The Strait of Magellan is located in South America. It is a navigable sea passage that separates mainland South America to the north and Tierra del Fuego to the south.
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Straits of Magellan
The Strait of Magellan is located at the southern end of South America, just north of the Tierra del Fuego. It is a natural passage between the Atlantic and Pacific oceans, and was named for Ferdinand Magellan.
Cape horn and strait of Magellan
You're thinking of Drake Passage, the wildest water on earth, some say, a distance of about 800 Km where the South Atlantic meets the South Pacific, and the northern border of the Southern Ocean.