What Rivers to the west of this line flow into the pacific ocean?

I'm sorry, I'm not quite sure what your question is. Are you asking, "Which river flows down the East Side of Manhattan, and into the Atlantic Ocean?"

If so, then, the answer is the East River. However, the East River is not a true river, as it connects to the ocean on both sides. It is an estuary or tidal strait. The East River flows south from the bay known as the Long Island Sound, down the east side of Manhattan and the west side of Queens and Brooklyn, and into the Atlantic Ocean.

The Hudson River (which IS a true river) flows down the west side of Manhattan, and into the Atlantic Ocean.