Vast amount

SEA

Think of a large body of salty water that covers most of Earth’s surface and often symbolizes boundlessness.

"Vast amount" hints at something large and expansive, like an ocean. The answer "SEA" fits because it’s a common term for a huge body of water, often used to describe immense spaces. The clue plays on the idea of scale—while "sea" isn’t the biggest (that’d be "ocean"), it’s still a well-known word for a vast, open expanse. No tricks here, just a straightforward definition.