About formation
delta - a lower triangular space of alluvial deposits where by a river divides before entering a bigger body of h2o; "the Mississippi River delta"; "the Nile delta"British isles:*British isles And maybe other pronunciationsUK And maybe other pronunciations/fɔːrˈmeɪʃən/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/fileɔrˈme�