What does a littoral owner refer to?

A littoral owner refers specifically to an individual or entity that owns land adjacent to a body of water that is generally considered non-flowing, typically lakes or oceans. This designation implies certain rights related to the use and enjoyment of that water body. Littoral rights commonly include access to the water, the right to use the water for reasonable purposes, and the right to any natural resources on or near the shoreline.

In contrast, the other options describe different types of property ownership or rights. For example, flowing rivers relate to riparian ownership, where rights are attached to land adjacent to moving water. Rights to underground water pertain to groundwater management, which is a different legal context regarding water resources. Specialization in water management typically falls under professional roles rather than ownership rights. Thus, the definition of littoral ownership is accurately described by the context presented in the correct choice.