Fig. 1From: Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical PacificMap of eastern Asian and the northwestern Pacific regions showing the locations of Miyako Island and Okinawa Island (this study) and Ishigaki Island (Abe et al. 2009; Hirabayashi et al. 2017) and Kume Island (Ohmori et al. 2014) discussed in the textBack to article page