Exterior surface of a boat hull
FIG. 1 is a rear perspective view of the exterior surface of a boat hull showing my new design; 
     FIG. 2 is a front perspective view thereof; 
     FIG. 3 is a side elevational view thereof; 
     FIG. 4 is a rear elevational view thereof; 
     FIG. 5 is a front elevational view thereof; and 
     FIG. 6 is a bottom plan view thereof.