Ili m'mphepete mwa nyanja ya Nayarit, ku Bahía de Banderas, zilumbazi zimapangidwa ndi zilumba zazing'ono ziwiri ndi zilumba zazing'ono ziwiri zamapiri.
Zochita za mphepo, dzuwa, mvula ndi mafunde zasintha gawoli, ndikupanga magawo osiyanasiyana omwe amachititsa kuti pakhale zamoyo zosiyanasiyana. Zilumba za Marietas mungapeze mbalame zam'nyanja zambiri zomwe zimakhala komanso zosamukasamuka, zomwe zimapezekanso, zomwe zimadziwika kuti boobies, gulls ndi pelicans.
Mitundu yambiri yamtundu imapezekanso kunyanja, monga ma mollusk, echinoderms, crustaceans, cnidiaries ndi elasmobranchs, zomwe zimapangitsa kukhala malo osangalatsa kwambiri pamadzi othamangirako ndi kuwoloka nkhonya. Zilumbazi zalengezedwa kuti ndi Special Biosphere Reserve.