isthmus

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isthmus

(ĭs`məs), narrow neck of land connecting two larger land areas. Since it commands the only land route between two large areas and is on two seas, an isthmus has great strategical and commercial importance and is a favorable situation for a city. In modern times many isthmuses have been cut through by canals to eliminate the necessity of land transport. The most important isthmuses are the Isthmus of Panama, connecting Central and South America, and the Isthmus of Suez, joining Asia and Africa. Canals were dug through both of these. The Isthmus of Corinth between the Morea peninsula and central Greece also has a canal.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Isthmus

 

a relatively narrow strip of land that connects larger land areas, such as two continents (Isthmus of Suez, Isthmus of Panama) or a peninsula and the mainland (Perekop Isthmus). Some isthmuses, such as the Karelian Isthmus, separate two bodies of water.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

isthmus

[′is·məs]
(biology)
A passage or constricted part connecting two parts of an organ.
(geography)
A narrow strip of land having water on both sides and connecting two large land masses.
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

isthmus

1. a narrow strip of land connecting two relatively large land areas
2. Anatomy
a. a narrow band of tissue connecting two larger parts of a structure
b. a narrow passage connecting two cavities
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005