Learn English – What to call the spray of sea water

You might consider waterbody but it is a less common word and it is often spelled as water body. It covers small bodies of water too but it depends on the context also.

A body of water or waterbody is any significant accumulation of water, generally on a planet's surface. The term body of water most often refers to large accumulations of water, such as oceans, seas, and lakes, but it includes smaller pools of water such as ponds, wetlands, or more rarely, puddles

http://en.wikipedia.org/wiki/Body_of_water

Example usage:

Although Lake Victoria is a very useful waterbody for transport, a floating vegetation known as hyacinth is threatening its existence.

[Peak Revision K.C.S.E. Geography By M. W. Magu]

Though, you can consider waterway also:

A waterway is any navigable body of water. A shipping route consists of one or several waterways. Waterways can include rivers, lakes, seas, oceans, and canals.

http://en.wikipedia.org/wiki/Waterway

The suggestion by Edwin Ashworth of engulfed gets at it. Synonyms of engulfed include swamped, submerged, submersed, immersed, innundated, consumed, overwhelmed, enveloped, swallowed up...

Online etymologies have this to say about engulfed:

Late 14c., "profound depth," from Old French golf "a gulf, whirlpool," from Italian golfo "a gulf, a bay," from Late Latin colfos, from Greek kolpos "bay, gulf of the sea," earlier "trough between waves, fold of a loose garment," originally "bosom," the common notion being "curved shape."

This is from PIE *kwelp- "to arch, to vault" (compare Old English hwealf, a-hwielfan "to overwhelm"). Latin sinus underwent the same development, being used first for "bosom," later for "gulf" (and in Medieval Latin, "hollow curve or cavity in the body"). The geographic sense "large tract of water extending into the land" (larger than a bay, smaller than a sea, but the distinction is not exact and not always observed) is in English from c. 1400, replacing Old English sæ-earm. Figurative sense of "a wide interval" is from 1550s.

My apologies for wasting an "anwer" when a comment would have been more appropriate but I'm too new to this SE to be able to comment.