No silly waves are on land. Have you ever heard of earth’s largest wave? Wave Everest. A lot of people climb it every year. Sometimes they call them land waves to distinguish them further from water mountains.

When a ship gets far away and you only see the top half, it’s behind a flat Earth water mountain.

have you people never seen an ocean? when you see ships go far enough out you see them disappear behind the curvature of the earth, you’ll see masts of sailboats sticking up and the like.