Clip and project a rectangular subset of the map. The LONGMIN= and LONGMAX= options specify the minimum and maximum longitudes to be included in the map projection.The LATMIN= and LATMAX= options specify the minimum and maximum latitudes to be included in the map projection.

proc gproject data=maps.states
              out=gulf
              longmin=81
              longmax=98
              latmin=25
              latmax=33;
   where density<5;
   id state;
run;