The Gunditjmara are traditionally river and lake people, with Framlingham Forest, Lake Condah and the surrounding river systems being of great importance to them economically and spiritually. Numerous distinct structures, extending over of the landscape, are employed for the purpose of farming short-finned eels, the staple of the Gunditjmara diet. These include stone races; canals; traps; stone walls; stone house sites and stone cairns. Some of the groundwork is older than the Egyptian pyramids. A controversy exists concerning the extent to which these features are the results of natural environmental processes or cultural modifications of the landscape by Indigenous people. Peter Coutts and others argued, in a work entitled "Aboriginal Engineers of the Western District, Victoria," that numerous features show the handiwork of Aboriginal landscaping for economic purposes. This thesis was challenged as a mythical "romancing of the landscape" by Anne Clarke, one that confused natural processes with socially crafted infrastructure. However, fresh archaeological work by Heather Builth led to her contending that they had a sophisticated system of aquaculture and eel farming. They built stone dams to hold the water in these swampy volcanic areas, especially the area comprising the lava flow of the "Budj Bim" volcano, creating ponds and wetlands in which they harvested short-finned eels ("kuyang" or more commonly "kooyang").