Please rephrase - the question is unclear.
It does not flow into a sea. It is a tributary of the Rhine River.
It flows into the Thames Estuary, North Sea at Southend-on-Sea, Essex, UK
which sea or ocean does the river yensei flow into
The river Nile flow into Mediterranean sea
The river flows into the Irish Sea at Lytham
it joins the river ouse
Rivers flow into the Caspian Sea, they do not flow out of. An example is the Volga River.
affluent - sea water effluent - river water (the flow out of sea) influent - river water (the flow into sea)
The Sea of Cortez.
Arabian sea
In Caspian Sea