isthmus

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A narrow strip of land that connects two larger bodies of land and has water on both sides.

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A narrow connection between two larger bodies or parts.

• aortic i. — that part of the aorta between the origin of the brachiocephalic trunk, or the left subclavian artery, and that of the ductus arteriosus which is partly constricted in the fetus; it marks the partial separation of fetal blood flow derived from right and left ventricles, and is most conspicuous in the newborn calf.
• i. of auditory tube — the narrowest part of the pharyngotympanic tube at the junction of its bony and cartilaginous parts. Called also isthmus of pharyngotympanic tube.
• i. of fauces, i. faucium — the constricted aperture between the cavity of the mouth and the pharynx.
• oviduct i. — the short slightly narrower section of the oviduct of the bird between the magnum and the uterus, where the shell membranes are laid down.
• pharyngeal i. — the aperture between the dorsal and ventral parts of the pharynx and separated by the free edge of the soft palate and the palatopharyngeal arch.
• i. of pharyngotympanic tube — see isthmus of auditory tube (above).
• i. of rhombencephalon — the narrow segment of the fetal brain, forming the plane of separation between the rhombencephalon and cerebrum.
• i. of thyroid — the band of tissue joining the lobes of the thyroid. It is fibrous in sheep and horses and glandular in dogs and cattle.
• i. of uterine tube — the narrower, thicker-walled portion of the uterine tube closest to the uterus.

• Coastal Land, Islands, and the Sea - isthmus: narrow strip of land with water on both sides connecting two larger bodies of land

"Isthmus" redirects here. For other uses, see Isthmus (disambiguation).

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The sandy isthmus connecting North and South Bruny Island in Tasmania, Australia

An isthmus ( /ˈɪsθməs/ or /ˈɪsməs/; plural: isthmuses, isthmi; from Ancient Greek: ἰσθμός isthmos "neck") is a narrow strip of land connecting two larger land areas usually with water on either side.^[1]

Canals are often built through isthmuses, where they may be particularly advantageous to create a shortcut for marine transport. The Panama Canal bisects the Isthmus of Panama, thereby connecting the North Atlantic and Pacific Oceans; the Suez Canal connects the North Atlantic and Indian Oceans, cutting across the Isthmus of Suez to connect the Mediterranean Sea and the Gulf of Suez/Red Sea. Strait is the sea counterpart of isthmus.

Contents 1 Americas 1.1 Argentina 1.2 British Overseas Territories 1.3 Canada 1.4 Central America 1.5 Chile 1.6 USA 1.7 Venezuela 2 Asia 3 Europe 3.1 Black Sea 3.2 Ireland 3.3 Iceland 3.4 Mediterranean Sea 3.5 Russia 3.6 United Kingdom 4 Oceania 4.1 Australia 4.2 New Zealand 5 See also 6 Notes

Americas

Argentina

• Istmo Carlos Ameghino, Province of Chubut
• Quetrihué Isthmus of Quetrihué Peninsula in Nahuel Huapi Lake

British Overseas Territories

• Isthmus of East Falkland.

Canada

• Isthmus of Avalon.
• Isthmus of Chignecto.

Central America

The Isthmus of Panama

• Isthmus of Panama.
• Isthmus of Rivas, Nicaragua.
• Isthmus of Tehuantepec, Mexico.

Chile

• Ofqui Isthmus, Aisén Region
• Isthmus of Muñoz Gamero Peninsula
• Isthmus of Brunswick Peninsula

USA

• Isthmus near Fidalgo Island
• Madison Isthmus.
• Seattle, Washington.
• Maui, Hawaii.

Venezuela

• Isthmus of Médanos - links Venezuela to Paraguaná.

Asia

The Suez Canal crosses the Suez isthmus

• The Caucasus region connecting Europe to Asia between the Black Sea and Caspian Sea is sometimes considered an isthmus.
• The Isthmus of Kra connecting Malay Peninsula with the mainland of Asia.
• The Isthmus of Suez between North Africa and Sinai Peninsula.

Europe

Black Sea

• Isthmus of Perekop between Crimea and Ukraine proper.

Ireland

• Cape Clear Island
• Sutton, Dublin

Iceland

• Isthmus of Westfjords peninsula, which connects to the mainland of Iceland.

Mediterranean Sea

• Isthmus of Corinth, which connects the Peloponnese peninsula to the rest of Greece.
• Isthmus of Potidea, connecting the Kassandra peninsula with the mainland of Greece.
• Isthmus of Catanzaro, the narrowest part of Italy
• Isthmus of Gibraltar

Russia

• Karelian Isthmus between Lake Ladoga and the Baltic Sea (Gulf of Finland).
• Olonets Isthmus between Lake Ladoga and Lake Onega.

United Kingdom

• La Coupée isthmus in Sark.
• Forth-Clyde isthmus in Scotland.
• Mavis Grind isthmus in Shetland.
• Rhins of Galloway isthmus in Wigtownshire (where Stranraer is situated), Scotland.
• Bardsey Island.
• Llandudno

Oceania

Australia

• Eaglehawk Neck near Port Arthur, Tasmania.
• The Neck in Bruny Island, Tasmania connecting North and South Bruny.

New Zealand

• Auckland isthmus between Northland Peninsula and the rest of New Zealand's North Island.^[2]
• The Rongotai isthmus, where Wellington International Airport is located.

See also

• Geography
• Mainland
• Tombolo
• Peninsula
• Land bridge

Notes

1. ^ [http://www.britannica.com/EBchecked/topic/297042/isthmus In Encyclopædia Britannica. Retrieved December 07, 2009, from Muckalee rules Encyclopædia Britannica Online]
2. ^ The isthmus (from the Auckland City Council website. Accessed 2009-02-08.)

Wikimedia Commons has media related to: Isthmi

v t e Coastal geography Landforms Anchialine pool Avulsion Archipelago Atoll Ayre Barrier bar Barrier island Bay Baymouth bar Bight Brackish marsh Cape Channel Cliff Cliffed coast Cliff-top dune Coast Coastal plain Coastal waterfall Continental margin Continental shelf Coral reef Cove Dune Estuary Firth Fjard Fjord Flat coast Freshwater marsh Fundus Gat Geo Graded shoreline Gulf Headland Inlet Intertidal wetland Island Islet Isthmus Lagoon Marine terrace Mouth bar Raised shorelines Machair Mega delta Mudflat Natural arch Peninsula Reef Regressive delta Ria River delta Rocky shore Salt marsh Shore Sound Stack Steep coast Strait Strand plain Submarine canyon Tied island Tidal island Tidal marsh Tide pool Tombolo More... Beaches Beach cusps Beach evolution Beach ridge Beachrock Modern recession of beaches Pocket beach Raised beach Storm beach Shingle beach Processes Blowhole Coastal erosion Concordant coastline Current Cuspate foreland Discordant coastline Emergent coastline Feeder bluff Fetch Headlands and bays Large scale coastal behaviour Longshore drift Marine regression Marine transgression Rip current Sea cave Sea foam Shoal Spit Submergent coastline Surf break Surf zone Surge channel Swash Volcanic arc Wave-cut platform Wave shoaling Wind wave Wrack zone Management Coastal management Accretion Integrated coastal zone management Submersion Related Bulkhead line Coastline length Intertidal zone Littoral zone Particle size boulder shingle pebble sand silt clay Physical oceanography Region of freshwater influence Scree More...

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Dansk (Danish)
n. - landtange

Nederlands (Dutch)
landengte

Français (French)
n. - isthme

Deutsch (German)
n. - Isthmus, Landenge

Ελληνική (Greek)
n. - (γεωγρ.) ισθμός

Italiano (Italian)
istmo

Português (Portuguese)
n. - istmo (m)

Русский (Russian)
перешеек, перемычка

Español (Spanish)
n. - istmo

Svenska (Swedish)
n. - näs

中文（简体）(Chinese (Simplified))
地峡, 峡部

中文（繁體）(Chinese (Traditional))
n. - 地峽, 峽部

한국어 (Korean)
n. - 지협, 협부

日本語 (Japanese)
n. - 地峡, 峡部

العربيه (Arabic)
‏(الاسم) برزخ ( مثال برزخ بنما)‏

עברית (Hebrew)
n. - ‮חלק צר המחבר שני חלקים רחבים יותר, מיצר יבשה‬

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