Stuff in a drainage basin

Drainage basin

The area of land drained by a river.

Watershed

The edge of highland

The edge of highland surrounding a drainage basin. It marks the boundary between two drainage basins.

Source

The beginning or start of a river

River

Natural wide flows of freshwater across land that store water temporarily before water flows into another waste body

River banks

Physical confine of a river

Confluence 

The point at which two rivers join

Tributary 

A stream or smaller river which joins a Larger river or stream

Distributary

Where rivers branch off to form smaller streams

Mouth

The point when the river comes to an end,usually when entering a sea

Ground water 

Groundwater is water that is stored in layers of soil and rocks following percolation of water, lying above an impermeable layer.

Water table

The top level of saturated ground in the soil - it rises and falls depending on the amount of rain.

Meander 

Curve in river