Nestled deep within Nelson Lakes National Park in New Zealand's Southern Alps, Lake Rotoroa is widely regarded as one of the premier wilderness trout fisheries in the country. The lake sits in a stunning alpine setting, surrounded by rugged mountain terrain and old-growth forest, offering anglers an experience that combines world-class fishing with extraordinary natural beauty. The lake is the source of the Gowan River, which flows downstream to join the Buller River system — one of New Zealand's most celebrated fisheries. The clear, pristine waters of Lake Rotoroa support a healthy population of brown trout, and the surrounding network of rivers and streams — including the Sabine and D'Urville rivers — extends the fishing opportunities across roughly 40 nearby waterways, making this region a destination that can keep dedicated fly anglers occupied for weeks.