» In geography, the isthmus's the narrow strip of land connecting 2 larger areas of land.:For the isthmus of Graph Theory go to Bridge (graph theory). An isthmus (; plural: isthmuses, isthmi)'s a narrow strip of land connecting two larger land areas. Of note, the Isthmus of Panama connects the continents of North and South America (the Americas), and the Isthmus of Suez in Egypt connects Africa and Asia (or Eurasia). Canals are often built on isthmuses where they may be particularly advantageou… (More on Isthmus)