This image is a view of the American Falls as seen from Queen Victoria Park on the Canadian side of the river.
There is no description on the back of the card, only the legend printed above the falls on the front.
The boat depicted is the famous Maid of the Mist tour boat, which was first used in ferry service before the American Civil War. It was relaunched as a tour boat service in 1895.
The image was originally black and white, then professionally colored. However, the pink ring on the image is a stain from a glass. The postcard was used and is dated 1957.