A geographic region where certain dangerous fly species transmit diseases like sleeping sickness, particularly in sub-Saharan Africa.
From 'fly' + 'belt' (Old English 'beltan' meaning 'to encircle'). Medical and geographic term from 19th-century African exploration and colonial medicine.
The 'tsetse fly belt' across Africa represents one of nature's most significant barriers to civilization—an entire continent shaped by an insect smaller than your pinky fingernail.
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