The 1977 ICF Canoe Slalom World Championships were held in Spittal, Austria under the auspices of International Canoe Federation for the record setting third time. Spittal hosted the championships previously in 1963 and 1965. A record ten countries won medals at these championships, including the first for Australia.
References
1977 ICF Canoe Slalom World Championships Wikipedia(Text) CC BY-SA