As part of an eroded dyke of the volcano, the Rocks are situated just outside the present day caldera wall about 20 km from Mount Warning and three kilometres from Nimbin village. The three most prominent are known as the Thimble, Cathedral and Needle. They are an extremely significant cultural site to the local Bundjalung tribe of indigenous Australians who believe the rocks were home to the Nmbngee, or Clever Men. They were also initiation grounds for young boys and the dreaming story can be read at the Nimbin Museum.