Rich from what I can gather the Delaware river has no "state boundry" It is assummed the river belongs to both states and both states have reciprical jurisdiction. That is you can fish the entire river while in Pa or NJ with either state license. Now in Port Jervis NY. all 3 states NY NJ and Pa have jurisdiction and not all are reciprical. Each state has a border on the river here and each state has different licensing regs. I will have to look them up for you. As far as a geographic distinctive boundry that will also take a little bit of research. As far as a boundry goes. Whatever state you launch from you can fish the entire river to the opposite shore. The reciprical license agreement includes shore fishing embankments
How inappropriate to call this planet Earth when it is quite clearly Ocean.
Arthur C. Clarke