Back Mar Sundance Catalan Sundance Sea English Mar de Sundance Spanish Mer de Sundance French Sundancehavet NN Море Санденс Ukrainian
The Sundance Sea was an inland or epeiric sea covering much of western North America in the Jurassic period. It was an arm of what is now the Arctic Ocean, and extended through what is now western Canada into the central western United States. The sea receded (moved back) when highlands to the west began to rise.