One of the two principal headwaters of the Nile River. It rises from Lake Tana in northwestern Ethiopia and flows about 1,000 miles (1,600 km) south and then northwest into Sudan, where it meets the White Nile at Khartoum.
/ˈˌblo͞o ˈnīl//ˈˌblu ˈnaɪl/
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