Exodus14

To be completely honest, this chapter doesn't say  which sea the Israelites crossed on the way out of Egypt.

More conservative scholars generally say the Red Sea. More liberal ones usually say that's a mistranslation of "Sea of Reeds", a swampy area where the water was only a few Inches deep.

Personally I don't much care. Either God split an arm of the Indian Ocean or he drowned the cream of the Egyptian army in less than a foot of water. Either way, that's one bad mamma-jamma.