Question

Where does surface water collect if it does not flow to the ocean?

Answer 1

In wetland surface

I HOPE IT'S HELPFUL

Answer 2

The water will collect in the wetlands and marshy lands if it will not flow to the oceans.

The places having lower altitude, the rivers, the grounds. Surface and will become the runoff.

Due to the gravitational force, the water flow from higher altitude to the lower.

That is the reason for marking the higher altitude from the sea level.