The Taponga River is a fast-flowing tributary of the Big River, located upstream of Lake Eildon in Victoria, Australia. It carves through steep forested terrain with a gravel substrate, giving it the character of a classic mountain freestone stream. The river is known for its self-sustaining trout population, meaning it is not stocked — the fish here are wild, and the fishing reflects that natural quality. Access is challenging through most of its length due to the steep and densely forested surroundings, though the lower reaches are more approachable and offer the most practical fishing opportunities.