The Borenore Caves, contained within the Borenore Karst Conservation Reserve, are a series of limestone caves that are located in the Central West region of New South Wales, Australia. The caves are renowned for their karst qualities, namely the numerous fossils from a long-lived reef complex from the Silurian period. Fossils include corals, crinoids, brachiopods, gastropods, pentamerids, colonial tryplasmids and trilobites. Borenore's karst is totally surrounded by igneous rock that flowed from volcanic eruptions at nearby Mount Canobolas.