Final answer:
Lake Pontchartrain, Lake Charles, Grand Lake, and White Lake are all located in the state of Louisiana.
Step-by-step explanation:
The state that has Lake Pontchartrain (a large brackish lake and the 2nd largest salt water lake in the US), Lake Charles, Grand Lake, and White Lake is Louisiana. Lake Pontchartrain is an estuary located in southeastern Louisiana to the north of New Orleans.
Notably, the lake and mentioned regions are part of the expansive ecological and hydrological network that benefits from the Mississippi Basin, contributing to the state's geographical and environmental diversity.