Keywords: SouthernSectionUpperGeyserBasinCastle.JPG en Southern section of Upper Geyser Basin Yellowstone National Park with Castle Geyser annotated Screen captured from National Park Service website http //www nps gov/archive/yell/tours/oldfaithful/oftourmap htm with additional data added NPS Mike Cline 2009-01 PD-USGov Maps of Yellowstone National Park Castle Geyser |