Answer :
Isthmus means a narrow strip of land, which is exactly what Central America is.
Isthmus represents a land that is in narrow strip form, which does both that is separate two sea bodies as well as joints two landspecaes.
Central America is regarded as the isthmus due to its feature of connecting lands that is Mexico and South America. Similarly, it separates the pacific ocean with Caribbean Sea.
Therefore, Central America starts from the south where there is Mexico towards the northwestern regions from where South America starts.
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