Rivers and streams can appear calm on the surface but there may be: Strong undercurrents that can pull under even a strong and experienced swimmer.
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Undercurrent is a flow of water below the surface: In an ocean, a subsurface current, a water current which flows beneath and usually independently of surface currents. In a river, a subsurface current (see whitewater)
Swimming in rivers can be dangerous for a few reasons. Rivers can be very deep and have strong currents, which can make it difficult to stay afloat. Rivers can also be filled with debris such as branches, rocks, and even snakes, which can cause injuries.
Dispelling the Myth of the RipRip currents do not pull people under the water; they pull people away from shore. The rip current is typically the strongest about a foot off of the bottom, which can cause your feet to be knocked out from under you making it feel like something under the water was pulling you.
The Thames is considered to be the cleanest river in the world that flows through a major city. The Thames is home to 125 species of fish and more than 400 invertebrates.