Assertion: drainage basin | /r/HasProperty | more than 40,000 square miles
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Source sentences:
text: At the base of the delta lies the Gulf of Ob, which is some 500 miles (800 km) long and has a width reaching 50 miles (80 km); the gulf’s own catchment area (forest tundra and tundra proper) is more than 40,000 square miles (105,000 square km).