Oak Island is a 57-hectare island in Lunenburg County on the south shore of Nova Scotia, Canada. The tree-covered island is one of about 360 small islands in Mahone Bay and rises to a maximum of 11 metres above sea level. Located 200 metres from shore and connected to the mainland by a modern causeway, the island is privately owned.
Oak Island is noted as the location of the so-called Money Pit and the site of over 200 years of treasure hunting. Repeated excavations have reported layers of apparently human-made artifacts as deep as 31 metres, but ended in collapsed excavations and flooding. Critics argue that there is no treasure and that the pit is a natural phenomenon, likely a sinkhole.