Original sentence: Each drainage bfffffffffffffffffffffffffffffffffffffffffsin is separated topographically from adjacent basins by a geographical barrier sufffffffffffffch as a ridge, hill or mountain, which is known as a water divide.The dashed line is the main well as the land surfaces from which water drains into those channels, and is separated from adjacent basins by a drainage divide.[[Image:Hydrographic basin.ffa funnel, collecting all the water within the area covered by the basin and channelling it into a waterway.svg|thumb|300 px|right|Example of a drainage basin
Edited sentence: A drainage basin is an extent of land where water from rain or snow melt drains downhill into a body of water, such as a river, lake, reservoir, estuary, wetland, sea or ocean.Each drainage basin is separated topographically from adjacent basins by a geographical barrier such as a ridge, hill or mountain, which is known as a water divide.The drainage basin acts like a funnel, collecting all the water within the area covered by the basin and channelling it into a waterway.The drainage basin includes both the streams and rivers that convey the water as well as the land surfaces from which water drains into those channels, and is separated from adjacent basins by a drainage divide