Understanding the processes that drive soil formation is crucial for developing sustainable land-use strategies, as changing land-use practices and climate change exacerbate soil erosion. The formation of soils on carbonate bedrock requires substantial dust accretion as the underlying bedrock lacks siliciclastic material. In the Galilee, the fine particles are far-traveled from the Sahara and Arabian Deserts. However, our investigation of surface soils along a west–east transect across the Galilee reveals a substantial content of super-coarse, angular quartz silt and heavy minerals such as zircon, inconsistent with a purely distal origin. Here, it is proposed that glacial-interglacial cycles have transformed the nearby Haifa Bay from a sink of sediment during high sea-level stands to a source of coarse eolian sediments during glacial low stands. This proximal source provides the coarse siliciclastic fraction, which not only improves physical soil properties, such as soil texture, structure, and water retention, but also introduces phosphorus-rich apatite, thereby potentially enhancing overall soil fertility. This is a regional example of how glacial-interglacial sea-level fluctuations induced a source-to-sink reversal, activating local sediment reservoirs and reshaping proximal soil composition. Such processes played a key role in maintaining fertile landscapes that supported long-term human settlement in the eastern Mediterranean.