Te Ara-a-Kiwa / Foveaux Strait is a renowned and often tempestuous body of water separating the South Island from Rakiura / Stewart Island. It is widely recognized as one of New Zealand's most significant and productive marine environments. The strait is characterized by its exposed conditions, numerous islands, and rich benthic biodiversity, supporting a vast array of marine life. The waters are integral to Ngāi Tahu history and mahinga kai (food gathering), with many named reefs, sand banks, channels, and currents known as customary fishing grounds. The area includes large sheltered harbours like Paterson Inlet on Stewart Island and is a focal point for commercial fishing, aquaculture, and recreational pursuits.