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Perylene, a five-ring nuclear polycyclic aromatic hydrocarbon (PAH), has a different distribution pattern from anthropogenic PAHs. Its source, however, remains obscure, limiting its application as an environmental indicator. Here we examine perylene in the upper 85 m sediments of the ODP Hole 1202B from the southern Okinawa Trough. Over the past 20,000 years, the mass accumulation rate of perylene is substantially higher in the last deglaciation than the Holocene and last glacial maximum. Perylene presents a strong correlation with C₃₁ n-alkane (r = 0.55; p < 0.001), a biomarker for terrigenous organic matter, and a weak correlation with C_37:2 alkenone (r = −0.04; p = 0.23), a biomarker for marine organic matter. The mean δ¹³C value of perylene (−22.8‰ ± 0.6‰) is substantially higher than that of long chain n-alkanes (−30.7 ± 0.4‰), but close to that of fluvial organic matter in adjacent areas (−24.0‰ to −25 …