The Cougal Spiral is a heritage-listed single track railway tunnel and spiral feature of the North Coast railway line in Australia that connects New South Wales with Queensland through Richmond Gap in the Kyogle Council local government area of New South Wales, Australia. It was built during 1930. It is also known as the Border Loop railway formation and landscape, Cougal To Border Loop and Railway Spiral and Landscape. The property was added to the New South Wales State Heritage Register on 2 April 1999.