Sea water typically has a salinity of around $35\,g/kg$ although lower values are typical near coasts where river enter the ocean. Rivers and lakes can have a wide range of salinities, from less than $0-0.1\,g/kg$ to a few $g/kg$, although there are many places where even higher salinities are found. The dead sea has a salinity of more than $200\,g/kg$