define-drainage, drainage basin,water divide,perenial,gorges,river system
Please refer to these link for the answer
https://www.meritnation.com/ask-answer/question/what-are-gorges/drainage/5391454
https://www.meritnation.com/ask-answer/question/what-is-river-system/social-science/8374819
https://www.meritnation.com/ask-answer/question/define-the-term-i-drainage-ii-drainage-baasin-iii-water/drainage/8148729
https://www.meritnation.com/ask-answer/question/what-are-gorges/drainage/5391454
https://www.meritnation.com/ask-answer/question/what-is-river-system/social-science/8374819
https://www.meritnation.com/ask-answer/question/define-the-term-i-drainage-ii-drainage-baasin-iii-water/drainage/8148729