This is an aerial photograph from the NJ Department of Environmental Protection Aerial Photographs Collection showing the borough of Portland, Pennsyvlania, across the Delware River from Columbia (Knowlton Township) in Warren County, New JerseyJPEGhttps://doi.org/doi:10.7282/T3DV1KD7NJ Department of Enivronmental ProtectionPublicPortland, Pennsylvania 1972MapsPennsylvaniaNew JerseyRutgers University-New Brunswick