The water level of the Nile near the confluence of its two major tributaries, the White Nile and the Blue Nile, starts to gradually decline after unprecedented floods in Khartoum, Sudan, Sept. 11, 2020. Sudan often witnesses floods caused by heavy rains from June to October. (Photos: Xinhua)

The water level of the Nile near the confluence of its two major tributaries, the White Nile and the Blue Nile, starts to gradually decline after unprecedented floods in Khartoum, Sudan, Sept. 11, 2020. Sudan often witnesses floods caused by heavy rains from June to October.

The water level of the Nile near the confluence of its two major tributaries, the White Nile and the Blue Nile, starts to gradually decline after unprecedented floods in Khartoum, Sudan, Sept. 11, 2020. Sudan often witnesses floods caused by heavy rains from June to October.

The water level of the Nile near the confluence of its two major tributaries, the White Nile and the Blue Nile, starts to gradually decline after unprecedented floods in Khartoum, Sudan, Sept. 11, 2020. Sudan often witnesses floods caused by heavy rains from June to October.