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Eramosa Karst

EKCA EKCA green pottruff Trail dogs
EKCA Tree river at karst stream

Please note: Upper Mount Albion Road is closed at Rymal Road. You can still access Upper Mount Albion and the Eramosa Karst from Highland Road.

The Eramosa Karst is the Hamilton Conservation Authority's newest conservation area. Filled with underground caves and streams, meadows and forests, this is one of the watershed's unique natural gems. Eramosa Karst is located in the south western section of Stoney Creek area of Hamilton. A perfect location for hiking, nature appreciation, and education, Eramosa Karst is a one-of-a-kind property in Hamilton's natural inventory.


Karsts are geological formations including underground drainage, caves and passages caused by dissolving rock, found in limestone formations like the Niagara Escarpment. The Eramosa Karst contains examples of 16 different karst features. The Ontario Ministry of Natural Resources designated the Eramosa Karst lands as an Area of Natural and Scientific Interest in 2003, because it is believed to have the largest number of unique karst features in any single area in the province. Several of its karst features are provincially significant. These include: soil pipes, a high concentration of suffosion dolines and sinking streams, overflow sinks, dry valleys and a 335 metre-long cave (the tenth longest in all of Ontario). There is also a natural dolomitic limestone bridge at the entrance of one of the sinkholes. The surface and groundwater drainage system that created the karst originated about 13,000 years ago, after the last glacier retreated. Today the drainage system sustains the karst and provides examples of karst processes and features in different stages of development.


The diversity of geological and hydrological features, and its central location in the Greater Golden Horseshoe, makes the Eramosa Karst one of the best sites in Ontario for education and research opportunities.

Eramosa Karst Videos

Take a video tour of the karst features. Marcus Buck, Hamilton karst expert and co-author of the report that helped turn the karst property into a provincial Area of Natural and Scientific Interest, leads us on a video exploration of the karst geological features that will be interpreted when the property is developed into Hamilton’s newest conservation area. (Video production courtesy of Van Valkenburg Communications). These are Windows Media Viewer files.

  1. Karst Introduction - (501 KB)
  2. What is a karst? - (883 KB)
  3. What is an ANSI? - (555 KB)
  4. Why should the karst area be preserved? - (622 KB)
  5. What is a sinkhole? - (919 KB)
  6. Nexus Cave - (1,024 KB)
  7. Key features of the karst area - (735 KB)
  8. Pottruff and Nexus Caves - (752 KB)
  9. Other features of the karst area - (1,078 KB)


With more than four kilometres of trails, boardwalks and bridges take you through escarpment forests and meadows, unique geological formations and a beautiful natural amphitheatre. Interpretive panels throughout display facts about the area's natural inventory and history.