Answer: France
Notes: After more than 100 years, swimmers officially returned to the River Seine in France since its closure in 1923. The River Seine is France’s second-longest river after the Loire, stretching 775 kilometers. Its drainage basin, called the Paris Basin, covers about 79,000 square kilometers in northern France. Around 62% of the basin supports agriculture, holding 25% of France’s farm activity and up to 30% of industry.
