Gaasyendietha, according to Seneca mythology, is a dragon that dwells in the deep areas of rivers and lakes of Canada, especially Lake Ontario. This dragon could fly on a trail of fire, and it could also spew fire.
It is also known as the 'meteor dragon', in reference to its supposed origin from a meteoroid that had impacted the Earth. It is also capable of crossing the heavens on a trail of fire. 
- "Sea Serpents of Canada", Charles Alexander Moffat.
- The Serene Dragon.
- Darek Isaacs (2010). Dragons Or Dinosaurs?: Creation Or Evolution?. Bridge Logos Foundation. p. 121. Retrieved 30 May 2011.
- Ash Dekirk (2006). Dragonlore: From the Archives of the Grey School of Wizardry. Career Press. p. 48. Retrieved 30 May 2011.
- Hewitt (ed.), J.B.N. (1918). "Seneca Fiction, Legends, and Myths". Annual Report of the Bureau of American Ethnology to the Secretary of the Smithsonian Institution. 32: 37. Retrieved Aug 17, 2018.
- Fee, Christopher R.; Webb, Jeffery B. (2016). American Myths, Legends, and Tall Tales. ABC-CLIO. p. 411. ISBN 978-1-61069-568-8. Retrieved Aug 17, 2018.
- Toronto Urban Legends: The Great Serpent of Lake Ontario
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