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.

Hudson River

Explanation:

Because it the biggest river plus it debated on the temperature