An example of an isthmus is a land bridge.
The isthmus of the thyroid.
The isthmus of the fallopian tubes.
above the sea, and is connected with the mainland by an isthmus 12 m.
It is served by the Panama railway, which crosses the Isthmus of Panama from ocean to ocean.
The first seems not to go farther southward than the Antilles and the Isthmus of Panama.
It was at a later period of his life that he propounded schemes for cutting canals through the isthmus of Suez and the isthmus of Panama.
In the interior of South America the Spanish conquerors had explored the region of the Andes from the isthmus of Panama to Chile.