If you had gills, you could likely swim in saltwater or freshwater environments. Some locations you could potentially swim would be:

1. The ocean - You could explore coral reefs and swim with marine life like fish, sharks, rays, turtles, and more. The open ocean would also be accessible to you.

2. Lakes - Many freshwater lakes around the world have great visibility for swimming and observing underwater plant and animal life.

3. Rivers - Major rivers like the Amazon, Mekong, and Yangtze present opportunities for exploration in freshwater environments.

4. Ponds - Smaller ponds and reservoirs would provide calm environments ideal for a gilled swimmer.

Having gills would expand your swimming capabilities beyond what is possible with lungs. You could stay submerged for longer periods and access aquatic habitats that are inaccessible to air-breathing swimmers. However, there are risks as well, including hazards like fishing hooks, boat propellers, pollution, and predation by larger aquatic creatures.

In summary, if you miraculously developed gills, you would have the freedom to explore and inhabit most aquatic environments on the planet - from the depths of the oceans to small ponds in your own backyard. But as with any ability, it would come with challenges and dangers that would require caution and care.
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