Vanastra is a dispersed rural community and unincorporated place in the municipality of Huron East, Huron County in southwestern Ontario, Canada, 3 kilometres (1.9 mi) southeast of the community of Clinton. It is located on the former property of a top secret Royal Canadian Air Force (RCAF) station used to train and supply over 7,000 radar technicians and support staff for American, British and Canadian forces during World War II.