What is meant by "navigable waters"?

The term "navigable waters" refers specifically to bodies of water that are capable of being used for interstate commerce or transportation. This definition aligns with legal standards that classify waterways as navigable if they are wide and deep enough to support commercial shipping and the movement of goods and services across state lines.

Recognizing the significance of navigable waters is essential, as they are governed by specific regulations, including those set forth by agencies like the U.S. Army Corps of Engineers and the Environmental Protection Agency. These regulations help ensure the safe and environmentally sound use of these waterways, which are crucial for economic activities, including trade and transportation.

In contrast, the other options describe specific uses or qualities of water bodies but do not accurately reflect the legal and commercial context of navigable waters. For example, while waters suitable for fishing or those used for recreational purposes may be important for local economies and communities, they do not necessarily meet the criteria for being classified as navigable. Similarly, waters that are always calm and safe are not a requirement for a body of water to be considered navigable; in fact, many navigable waters can experience challenging conditions. Thus, the correct answer encompasses the broader and more legally relevant understanding of navigable waters.