The oceans contain vast amounts of salt. According to sciencescore.com, the saltiest ocean is the Atlantic. Oceans at the poles are the least salty. But there is so much salt that if we managed to dry up all the water in the oceans, the seabeds would be covered by a pile of salt as tall as a 12 story building!
In fact, if you could gather all the salt around, you could build a wall around the equator a mile wide and 180 miles tall.