Lagoon n. : A shallow sound, channel, pond, or lake, especially one into which the sea flows; as, the lagoons of Venice.

Lagoon n. : A lake in a coral island, often occupying a large portion of its area, and usually communicating with the sea. See Atoll.

Example:
What is the best bait for fish in a fresh water Lagoon?

Taxonomy
Lagoon, Utah, Amusement park, water park, laguna beach, haunted house, Passports, Admission, Park Schedule, How to, to Get Here, Camping, Jobs, Special Offers, Fun Time, Time Club, Family Reunions, Guest Policies.

Defination from the web:
Lagoon is a historical amusement park with rides, entertainment, and adjacent campgrounds and R.V. park.