Roth extended his range of paleontological expeditions to Patagonia, including the areas along the Rio Negro, Limay River and Chubut River, partly together with F. Machon, another researcher from Switzerland from 1885 to 1891.
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River | Tocantins River |