Kanadaseaga (also spelled Kanatasaka and known as Seneca Castle), was a major village of the Seneca nation of the Iroquois Confederacy in west-central New York State, United States. It was located between the northern ends of Seneca and Canandaigua lakes, west of the present-day city of Geneva in the township of Seneca. The Seneca established this village at least as early as 1687.
Long known for being one of the most powerful Iroquois towns, it was destroyed by the rebel-led Sullivan Expedition of 1779 during the American Revolutionary War. Rebel colonial forces were seeking to punish the Iroquois for their raids and attacks on frontier settlements, especially in the Mohawk, Cherry and Schoharie valleys.