Eastern Pennsylvania
The densest archival cluster. Reports recur through the Lehigh Valley, Wyoming Valley, Reading corridor, lower Pocono region, and older river towns with extensive stormwater infrastructure.
Known Range
1891–present reportsThe Council recognizes a core Mid-Atlantic reporting corridor with secondary records elsewhere. Map points represent archived reports, not confirmed populations.
Interactive archive mapSelect the map to enable scroll zoom. Drag to pan.Numbered points show how many archived reports exist for that locality. Select a point to open the corresponding encounter records.
Map methodology
Displayed points are plotted at the geographic centre of the locality named in each report, not at witness addresses or exact incident coordinates, which are held offline. Where several reports share a locality they are combined into a single point and listed together; dense PA/NJ clustering is not visually jittered to suggest precision the underlying reports do not support. Base mapping is supplied by OpenStreetMap contributors. Select a point to open its source entry in the Encounter Database.
Northwestern New Jersey
Phillipsburg, Warren County, Sussex County, and Pine Barrens edge records show unusually consistent timing and boundary-use descriptions despite lower total volume.
Appalachian Extension
Scattered West Virginia, western Maryland, southern New York, and central Pennsylvania reports may represent a continuous corridor or multiple unrelated traditions.
Current Hotspot: PA–NJ Corridor
| Area | Archive pattern | Current assessment |
|---|---|---|
| Carbon / Northampton / Lehigh Counties, PA | High repeat-site density; creek and culvert associations | Elevated |
| Luzerne / Lackawanna Counties, PA | Long historical record; multiple-witness events | Elevated |
| Berks County, PA | Property disturbance and crawlspace reports | Watch |
| Warren / Sussex Counties, NJ | Utility corridor and wooded-edge sightings | Elevated |
| Southern New Jersey | Lower volume; auditory reports predominate | Watch |
Reporting Gaps
Low-report areas cannot be interpreted as absence. Historic coverage depended on newspaper access, mailed correspondence, cooperating local officials, and proximity to Council volunteers.
Range Boundaries
No stable northern, southern, or western boundary has been identified. Isolated reports outside the core corridor remain in the archive unless a conventional explanation is established.
Range classifications are revised annually. A single credible repeat site may alter local status without changing the broader regional assessment.
Historical range caution
Several possible early accounts originate inside the modern Pennsylvania–New Jersey concentration, but they are excluded from range calculations because attribution and dating cannot be verified.