Is the red sea salt water?

A lake is formed by a river, is landlocked and flows out by means of a river. Asea can be marginal, a marginal sea is surrounded by land but has an escape directly to the sea and can be fed also by the sea. Example: lake of Gaililee is formed by the water from the Hermon Mount and the former turns into the Jordan river. The lake of Caspia is formed by the flow from the Danube river and flows into rivers. The Persian Gulf or the Red Sea are marginal (surrounded by land) and are fed by the Arabian sea and flow into the same.