国际清洁运输理事会：2024年走向绿色货运美国内陆水道运输概览报告（英文版）

Inland waterways are mostly concentrated on the Eastern, Midwestern, and Southern United States (Figure 2). The Mississippi River, which originates in northern Minnesota and flows more than 2,000 miles south into the Gulf of Mexico, is the most important freight corridor in the IWT system. In 2022, the Mississippi accounted for the highest tonnage of all inland rivers, transporting 257 million tons (233 million metric tons), and the highest freight turnover, about 148 billion ton-miles (216 b