The word isthmus comes from Latin roots, specifically from the word “isthmus”, which in turn derives from the ancient Greek “ἰσθμός”. Commonly this term is used in geography, where it is understood or called isthmus to the strip, strip or narrow piece of land, which unites two larger extensions of land, which generally said extensions are surrounded by water, except the sector where the isthmus is located, which can unite islands, continents, a peninsula with the mainland, or an island with the mainland.

The best known isthmuses are the Isthmus of Panama that joins the Atlantic Ocean with the Pacific Ocean, and which is the central knot in the geography of the American countries, and has had notable importance in the history of the American continent. And another of them is the Suez linking Africa with Asia; both considered of great strategic military and commercial value, since due to their nature as isthmuses they lend themselves to making channels of great importance for navigation and therefore for trade. As well as those mentioned above, there are other relevant isthmuses around the world, for example in Europe there is the Isthmus of Corinth, specifically in the Mediterranean Sea, which connects the Peloponnese peninsula with the rest of Greece, or also the Isthmus of Bolbs, which links Gibraltar with mainland Spain; in Asia is the isthmus of Kra, located in Southeast Asia, which connects the Malay Peninsula with the continent of Asia; Next, in the American continent there are isthmuses such as Madison and Seattle, Washington in the United States, in Venezuela there is the Los Médanos isthmus, which joins Venezuela and Paraguaná in the state of Falcón. Among many other isthmuses located around the world on different continents.

On the other hand, in anatomy, the slot or opening limited by the soft palate between the mouth and the pharynx is called the isthmus of the fauces. And finally there is the isthmus of the brain, this is the lower and middle part of the brain, where the cerebrum, cerebellum and medulla meet.