The isthmus of Panama.
the connection
The Panama Canal is a man made body of water that connects the Atlantic Ocean with the Pacific Ocean.
isthmus of panama
It's a strait. Like the Straits of Magellan links the Atlantic Ocean and the Pacific.
If you mean the most narrow navigable "passage" then it's the Panama Canal, given the Pacific Ocean flows into the canal, then exits into the Caribbean Sea, which flows into the Atlantic. If you mean a natural "opening," then it's the "Drake Passage." From one source: "This opening connects the Pacific and Atlantic oceans and encircles Antarctica in a ring of cool water known as the Antarctic Circumpolar Current" (See related links below).
The geographical formation that separates the Americas is the Isthmus of Panama. This narrow strip of land connects North America and South America, forming a natural barrier between the Atlantic and Pacific Oceans. The Panama Canal, constructed through the isthmus, allows ships to traverse between the two oceans, significantly facilitating maritime trade.
The Atlantic Ocean is connected to the Pacific Ocean through a narrow canal called the Panama Canal. From the Caribbean Sea on the Atlantic side, the canal cuts through Panama, to the Pacific Ocean.
The Isthmus of Tehuantepec that connects the Gulf of Mexico and the Pacific Ocean is in Mexico. The isthmus name means "jaguar hill".
Drake Passage separates South America and Antarctica. It is a narrow stretch of water connecting the southern Atlantic and southern Pacific Oceans.
narrow. Also long.
The Dardanells.