Among other circumstances relevant to maritime delimitations, some States have recently used the protection of underwater cultural heritage (UCH) as grounds for advancing jurisdictional or sovereignty claims over different maritime areas. After identifying the contours of current international law governing that heritage, this book critically addresses: first, the generally limited use of archaeological heritage in territorial claims; second, the broad acceptance by States of ‘archaeological maritime zones’ that overlap with declared contiguous zones; and, third, the (mis)use of UCH and underwater archaeology in three still disputed maritime claims, namely, Canada’s claim in Arctic waters, China’s in the South China Sea, and Russia’s in Crimea and its surrounding waters. Legal and ethical issues related to underwater archaeology are also discussed.