Linked from
The 5 pages that link to Sargasso Sea, each with the reason it gives.
EelBroader topic: It is the spawning region associated with the American and European eels.
SargassumRelated: Its name comes from the abundant floating Sargassum historically observed there.
CatadromyBroader topic: European and American eels are thought to reproduce in this ocean region.
LeptocephalusRelated: European and American eel larvae originate from spawning in this region.