Name of the longest canal in the western hemisphere?

Panama Canal

... most definitely not the Panama canal which is less than 100 miles in length, Erie canal is somewhere around 360 miles, does not mean this is the longest, but it certainly is the longest that I am aware of St. Lawrence seaway is somewhere around 2500 miles long but is not just a canal, its a mixture of canal, lake, river, and others that im unsure of