Assertion: total drainage area | /r/HasProperty | about 450,000 square miles
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text: Its total drainage area is about 450,000 square miles (1,165,000 square km), of which 175,000 square miles (453,000 square km) lie in the ranges and foothills of the Himalayas , the Hindu Kush , and the Karakoram Range ; the rest is in the semiarid plains of Pakistan .