1) Boats for heavy loads 2) Boats on a canal 3) Canal boats 4) Flat carriers 5) Flat-bottomed boats 6) Flat-bottomed canal boats 7) Flat-bottomed garbage boats 8) Garbage boats 9) Gondolas 10) Harbor sights 11) Inland waterway longboats 12) Lighters 13) River boats 14) River carriers 15) River transports 1) Flatboats 2) Scows 
Barges is slang for massive shoes.
flat boats used for hauling