the connection
The Panama Canal is a man made body of water that connects the Atlantic Ocean with the Pacific Ocean.
A canal such as the Suez Canal
A narrow waterway connecting two bodies of water is called a strait, like the Strait of Gibraltar. The deepest part of a river or waterway is known as the channel or the riverbed.
An isthmus is a thin piece of land that links two larger masses of land. A strait is a narrow waterway that joins two larger bodies of water. An example of a strait is the Strait of Magellan that connects the Pacific with the Atlantic Ocean. Likewise, the Isthmus of Panama links North America and South America.
The narrow bit is the Ithsmus of Panama, but of course the whole of the American Continent separates the Atlantic & Pacific.
canal
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 country is Panama. The canal is the Panama Canal. The Isthmus of Panama is the narrow strip of land that connects North America to South America.
The country is Panama. The canal is the Panama Canal. The Isthmus of Panama is the narrow strip of land that connects North America to South America.
canal
A strait is a narrow body of water that connects two larger bodies of water. The opposite (a narrow piece of land that connects two larger pieces of land) is called an isthmus.
The country is Panama. The canal is the Panama Canal. The Isthmus of Panama is the narrow strip of land that connects North America to South America.