Rivers  of the southern  Catskill Region* Trout Distribution Maps Click on Image to get map. *  Not shown here are the numerous small tributaries that drain into these five main rivers.   -The only other major stream on the NY side that is not shown is the Mongaup  River.  This stream enters the Main Stem of the Delaware between Pond Eddy  and Port Jervis. -Streams on the PA side are not shown as well.