Which river can swell to over 30 miles wide during its annual flooding season

The Amazon river can swell to over 30 miles wide during its annual flooding season.

Explanation:

The presence of a huge watershed area that receives rainfall which eventually runs away to meet the Amazon River keeps it in the state of a flooded river most time of the year.

The smaller rivers flowing down from the Ecuadorian Andes and the Peruvian Andes and coming to meet the Amazon River have a considerably higher velocity that the Amazon River cannot match with. Thus, the Amazon River is prone to swelling to a width of about 30 miles in the flooding season.

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the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

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