Evergreen

River basin  In high and hilly areas, the rainwater melts and meets in small streams, that place is called a river basin. In other words, the main river or the main river, numerous small branch rivers and minor rivers come out of the prime river, that region is called the river basin.Rivers in which high velocity is observed to be intermediate to low are called ideal rivers. Rivers that carry erosion, accumulation, etc. fall into ideal rivers.