The Nazaré Canyon is an undersea canyon just off the coast of Nazaré, Portugal, in the Eastern Atlantic Ocean. It has a maximum depth of at least 5,000 metres (16,000 ft) and is about 230 kilometres (140 mi) long. The canyon is being studied as part of the EU HERMES project using a remotely operated vehicle. The project is investigating the specialised canyon ecosystems, sediment transport and deposition, and the way in which the canyon influences and is affected by local ocean circulation. The

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