An isthmus ( /ˈɪsθməs/ or /ˈɪsməs/; plural: isthmuses; from
Ancient Greek: ἰσθμός, translit. isthmos,
lit. 'neck') is a narrow piece of land connecting two larger
areas across an expanse of water by which they are otherwise
separated. A tombolo is an isthmus that consists of a spit or bar,
and a strait is the sea counterpart of an isthmus.
Canals are often built across isthmuses, where they may be a
particularly advantageous shortcut for marine transport. For example,
Land bridge List of isthmuses List of straits
Wikimedia Commons has media related to Isthmi.
^ "Isthmus". Collins English Dictionary. Collins. Retrieved 19 December 2016. ^ LSJ entry ισθμός ^ "Isthmus". Britannica. Retrieved September 22, 2013.
v t e
Anchialine pool Archipelago Atoll Avulsion Ayre Barrier island Bay Baymouth bar Bight Bodden Brackish marsh Cape Channel Cliff Coast Coastal plain Coastal waterfall Continental margin Continental shelf Coral reef Cove Dune
Estuary Firth Fjard Fjord Freshwater marsh Fundus Gat Geo Gulf Gut Headland Inlet Intertidal wetland Island Islet Isthmus Lagoon Machair Marine terrace Mega delta Mouth bar Mudflat Natural arch Peninsula Reef Regressive delta Ria River delta Salt marsh Shoal Shore Skerry Sound Spit Stack Strait Strand plain Submarine canyon Tidal island Tidal marsh Tide pool Tied island Tombolo Windwatt
Blowhole Cliffed coast Coastal biogeomorphology Coastal erosion Concordant coastline Current Cuspate foreland Discordant coastline Emergent coastline Feeder bluff Fetch Flat coast Graded shoreline Headlands and bays Ingression coast Large-scale coastal behaviour Longshore drift Marine regression Marine transgression Raised shoreline Rip current Rocky shore Sea cave Sea foam Shoal Steep coast Submergent coastline Surf break Surf zone Surge channel Swash Undertow Volcanic arc Wave-cut platform Wave shoaling Wind wave Wrack zone
Accretion Coastal management Integrated coastal zone management Submersion
Bulkhead line Grain size
boulder clay cobble granule pebble sand shingle silt
Intertidal zone Littoral zone Physical oceanography Region of freshwater influence