The suez canal was built on the isthmus of suez and connected the

The Mediterranean the Red Sea, is the right answer.

Explanation:

The Suez Canal is a caliber water-route located in Egypt, which connects two major seas known as the Mediterranean the Red Sea. This canal was built in the years between 1859-1869 by the Suez Canal Company. Officially this canal was opened on November 17th, 1869. The canal contributes watercraft a major direct route connecting the North Atlantic and north Indian waters through the Mediterranean and Red sea.

Connected the Mediterranean sea to the red sea.