It is the Panama Canal. The canal cuts through the Isthmus of Panama, a narrow strip of land connecting North America from South America. The Panama Canal meant that ships could sail between the Pacific Ocean and the Atlantic Ocean, without taking the longer, more perilous voyage round Cape Horn (notorious for terribly stormy seas and weather).
The manmade waterway that connects the Atlantic and the Pacific oceans is the Panama Canal.
northwest passage
the connection
The Panama Canal was the waterway dug to connect Atlantic and Pacific Oceans.
Many thousands of humans were involved in the digging of the Panama Canal.
The Panama Canal connects the Atlantic and Pacific Oceans.
northwest passage
The Northwest Passage.
The Pacific and Atlantic oceans
Drake Passage.
Drake Passage.
"Amanaplanacanalpanama" is a palindrome, which means it reads the same forwards and backwards. In this case, it references the Panama Canal, a famous waterway that connects the Atlantic and Pacific Oceans.