汪洋 (wāng yáng): vast body of water

Standing by the sea, a vast expanse of water stretched before me, and I couldn't see the opposite shore.

The small boat tossed in the vast ocean; nothing but water was visible all around.

After the heavy rain, the entire village turned into a vast expanse of water, and all the houses were submerged.

He stood at the mountain top and looked into the distance; he saw only a vast expanse of water, unable to tell where the sky ended and the sea began.

Facing this vast ocean, he felt very small, like a drop of water in the sea.