19. This county is the home of the largest natural lake entirely within the borders of Pennsylvania.
From Quiz Pennsylvanian Counties
Answer:
Crawford County
Crawford County is located in northwestern Pennsylvania. The lake is Conneaut Lake. The key parts of this question are natural and entirely within Pennsylvania. Huntingdon County, in south-central Pennsylvania, is home to Raystown Lake the largest lake in Pennsylvania. Raystown, however, is a man-made lake, created by the damming of the Raystown Branch of the Juniata River. The largest natural lake with some part of it in Pennsylvania is Lake Erie, but Pennsylvania also shares Lake Erie with New York, Ohio, Michigan, and Ontario, Canada. Pennsylvania's only access to Lake Erie is in Erie County, PA (Ohio and New York also have Erie Counties, however, none of them touch one another). Westmoreland County is east of Pittsburgh, and while it does have some lakes, these are not major bodies of water.