RMS Segwun is the oldest operating steam driven vessel in North America, built in 1887 as Nipissing to cruise the Muskoka Lakes in the Muskoka, Ontario, Canada, a resort area with many lakes and rivers. Early in the 20th century, Muskoka was poorly served by roads. Vacationers were transported to lodges, or private cottages, via a fleet of steamships. Segwun is the oldest of only three ships in the world still carrying the status of Royal Mail Ship, and the only steamer.

Lake Muskoka is located between Port Carling and Gravenhurst, Ontario, Canada. The lake is surrounded by many cottages. The lake is primarily within the boundary of the Township of Muskoka Lakes, the southeast corner is within the boundary of the Town of Gravenhurst and another small portion around the mouth of the Muskoka River is within the boundary of the Town of Bracebridge. The town of Bala is located on the southwest shores of the lake, where the Moon River starts. Lake Muskoka is connected to Lake Rosseau through the Indian River and lock system at Port Carling. The lake is mainly fed by the Muskoka River, Lake Joseph and Lake Rosseau.