An ocean of something
Definition 1 of 1
Pro Tip 1/3Metaphorical Meaning
The phrase usually signifies abundance, not a physical ocean. 
She offered an ocean of support during tough times.
Pro Tip 2/3Emotional Weight
It often carries emotional emphasis, expressing strong feelings. 
His departure left her with an ocean of sadness.
Pro Tip 3/3Figurative Context
Use it in contexts that allow for figurative language, not formal reports. 
The charity event raised an ocean of funds.