Sea tangles are a type of seaweed that are commonly found in coastal areas. Synonyms for sea tangles include kelp, seaweed, marine algae, sea wrack, and sea grass. Kelp is a large type of seaweed that grows in underwater forests and can often be seen floating on the surface of the water. Seaweed is a broad term that encompasses many different species of marine plants, including sea tangles. Marine algae refers to any type of aquatic plant-like organism, while sea wrack is a term used for any type of seaweed that has washed up on shore. Sea grass is a type of flowering plant that grows in shallow coastal waters and is often mistaken for seaweed due to its similar appearance.