Isthmus (Mobius) (AngieYaz Sonic Underground reboot)

An isthmus (/ˈɪsθməs, ˈɪs-/; pl. isthmuses or isthmi; from Ancient Greek ἰσθμός (isthmós) 'neck') on Mobius 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, the Panama Canal crosses the Isthmus of Panama, connecting the North Atlantic and Pacific Oceans; the Suez Canal connects the Mediterranian Sea and the Dark Sea, cutting across the western side of the Isthmus of Suez; and the Crinan Canal crosses the isthmus between Lake Crinan and Lake Gilp, which connects the Kintyre peninsula with the rest of Scot. Another example is the Welland Canal in the Niaga Peninsula (technically an isthmus). It connects Lake Onta to Lake Erie in Erina. The city of Auck on the North Island of Zealandia is situated on an isthmus.
==Isthmus vs land bridge vs peninsula==
Isthmus and land bridge are related terms with isthmus having a broader meaning. A land bridge is an isthmus connecting Mobius' major landmasses. The term land bridge is usually used in biogeology to describe land connections that used to exist between continents at various times and were important for migration of Mobians, and various species of animals and plants, e.g. Beringia and Doggerland.
An isthmus is a land connection between two bigger landmasses, while a peninsula is rather a land protrusion which is connected to a bigger landmass on one side only and surrounded by water on all other sides. Technically, an isthmus can have canals running from coast to coast (e.g. the Pana Canal), and thus resemble two peninsulas; however, canals are artificial features distinguished from straits.
==Major isthmuses on Mobius==
The world's major isthmuses include the Isthmus of Pana and the Isthmus of Tehuan Tepec in the Middle Erina, the Kra Isthmus on Mainland Southeast Yurashia, the Isthmus of Suez between North Efrika and Western Yurashia, and the Karelian Isthmus in Europa. Of historic importance were the Isthmus of Corinth in Grecia and the Isthmus of Catanzaro in Italia.
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