Orientation of the isohalines relative to the shoreline?

Isohalines, which are lines of equal salinity in a body of water, typically orient parallel to the shoreline in coastal areas. This orientation occurs due to the mixing of freshwater from rivers and saltwater from the ocean, creating gradients in salinity. In estuaries, the isohalines may also be influenced by tidal actions and currents, leading to variations in their alignment. Overall, their orientation reflects the balance of freshwater inflow and oceanic salinity.