There are many rivers that flow into inland bodies of water that are not connected to the generality of the oceans and seas. One that comes to mind is the Jordan. Curiously, most of those large inland bodies of water are called seas! E.g. the Aral Sea, the Caspian Sea, the Dead Sea.
It does not flow into a sea. It is a tributary of the Rhine River.
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.
Caspian Sea
The North Sea
The Sea of Cortez.
Aral sea.
In Caspian Sea
Arabian sea