Inland Waters - Open Sea includes which of the following?

The correct choice identifies waters that are located within the limits of the United States but are still accessible to the open sea. This scenario describes areas like estuaries or bays that may not be directly on the coastline but are linked to the ocean. Understanding "Inland Waters - Open Sea" involves recognizing that these regions play a crucial role in ecosystems and maritime navigation, allowing for a transition between freshwater and saltwater environments.

Moreover, this understanding helps clarify the geographic and ecological significance of such waters, particularly in legal and regulatory contexts concerning shipping, fishing, and conservation efforts that may differ from those applied to coastal waters or those strictly contained within lakes. The other options address different classifications of water bodies that do not fit the criteria of being both inland and open to the sea, highlighting the specific nature of the correct choice.