They are sourced from small rivers which, at each pot, sink below ground. Dye tracing has linked these sinks to the underground river of the Prod's Pot–Cascades cave system. This river in turn rises at Cladagh Glen and feeds into the Cladagh River, before ultimately discharging into Upper Lough Erne.
The dye tracing has also proved a further underground link to Shannon Pot in County Cavan, suggesting that the latter may once have had a substantially larger catchment area.
^ abLaMoreaux, Dr. Philip E.; Tanner, Judy T., eds. (2001). Springs and Bottled Waters of the World: ancient history, source, occurrence, quality and use. Berlin: Springer-Verlag. p. 167. ISBN3-540-61841-4.