Mira Bay is a significant coastal inlet on the eastern shore of Cape Breton Island, Nova Scotia, serving as the tidal terminus for the expansive Mira River system. The bay receives the river's flow through the narrow channel known as the Mira Gut, creating a dynamic estuary where freshwater mixes with the Atlantic Ocean. The surrounding landscape is characterized by ancient geological formations, with the river valley cutting between 320-million-year-old Carboniferous rock to the north and even older Cambrian and Precambrian formations to the south. This environment supports a mix of inshore marine and estuarine fisheries, with noticeable tidal influence extending well inland from the bay itself.