A painting of the sea (as distinguished from a landscape) WordNet 3.0 & Open English WordNet

A seascape is a photograph, painting, or other work of art which depicts the sea, in other words an example of marine art. By a backwards development, the word has also come to mean the view of the sea itself, and be applied in planning contexts to geographical locations possessing a good view of the sea. Wikipedia

a work of art which depicts the sea Wikidata

A piece of art that depicts the sea or shoreline. Wiktionary

Piece of art that depicts the sea or shoreline. Wiktionary (translation)

An aquatic landscape; a view or site prominently involving water. Wiktionary

Aquatic landscape. Wiktionary (translation)