what is the nation's largest inland port, situated at the junction of 3 rivers?

This answer surprised me, but several other web sites also confirm it.

http://en.wikipedia.org/wiki/Huntington,_West_Virginia

The nation's largest inland port situated at the junction of three rivers is Huntington, West Virginia. To find this information, I used the search engine to search for "largest inland port in the US." One of the top search results was a Wikipedia page titled "Huntington, West Virginia." I clicked on the link to access the page and found the relevant information there. It is always a good idea to check multiple sources to verify the accuracy of the information.