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Location of hydrothermal fields studied. (a) A geographic overview of all of the hydrothermal fields, the Urashima and Snail sites in the South Mariana Trough, the NW Eifuku Seamount in the North Mariana Volcanic Arc, and the Tarama Knoll field in the Okinawa Trough. A yellow star indicates the sampling sites. (Base map from Google Maps.) (b to d) Bathymetric maps of the four hydrothermal fields. Red stars indicate the locations where sampling of the iron mats was conducted.
