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Under the protected areas tab, there was a link to a main webpage which dealt with marine reserves: http://www.inrena.gob.pe/ianp/web_sinanpe2006/sinanpe.htm
If you read Spanish, there is a list of all the protected areas in Peru, both on land and in sea.
(By the way, my uncle is head of this department, so if you have any consultations just e-mail him at areas.naturales@inrena.gob.pe)
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