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The late Middle Pleistocene Transition (MPT,~ 800-670 thousand years before present, ka) was characterised by the emergence of large glacial ice-sheets associated with anomalously warm mid North Atlantic sea surface temperatures (SST) enhancing moisture production. Still, the moisture transport across Eurasia towards high northern latitudes is poorly constrained despite its potential role as feedback mechanisms feeding the ice caps. To reconstruct late MPT moisture production and spreading, we combine records of upper ocean temperature and pollen-based Mediterranean forest cover, a tracer of westerlies and precipitation, from a subtropical drill-core collected off SW Iberia Margin, with records of East Asia summer monsoon (EASM) strength and West Pacific surface temperatures, and compare them with the iLOVECLIM model simulations. We observe that the strongest Mediterranean forest development …