Nèiliú qūyù de shuǐ zuìzhōng zhēngfā huò zhùrù húpō.
Water in endorheic regions ultimately evaporates or empties into lakes.
Tips
usage
Pairs with 外流 (outward-flowing, exorheic). 内流河 (inland river - flows into a desert or lake), 内流湖 (terminal lake). Standard physical-geography vocabulary in Chinese textbooks.