If you’re in a boat out on the water and you can’t see any land, then the body of water you’re in is probably vast, or enormous.

Things that are described as vast include oceans, seas, the heavens, deserts, and the surface of the moon. Even places that can't be seen or touched, like imaginations, are called vast, because of the endless ideas that come out of them. Someone with a vast imagination is very creative, and a place with a vast landscape is very large. Possibilities are vast, and so are the vocabularies of the world, filling vast volumes.

Definitions of vast
  1. adjective
    unusually great in size or amount or degree or especially extent or scope
    “the vast reaches of outer space”
    “"the vast accumulation of knowledge...which we call civilization"- W.R.Inge”
    synonyms: Brobdingnagian, huge, immense
    big, large
    above average in size or number or quantity or magnitude or extent
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