Why are the red, yellow and black sea called so?

Ancient mariners named the Red, Yellow, and Black Seas based on distinctive features. The Red Sea’s name comes from reddish-brown blooms of cyanobacteria. The Yellow Sea is named for the yellowish-brown tint from the Yellow River’s silt. The Black Sea’s name originates from its dark, treacherous waters and severe storms. These seas have been crucial maritime routes, facilitating trade and cultural exchanges for millennia, with each name reflecting unique environmental and historical characteristics.