Small, remote islands, such as low coral atolls, with nutrient‐poor, biogenic soils for food crops and vulnerability to extreme weather, have long been considered marginal environments for human habitation. Yet, four decades of archaeological research in the atoll archipelago of the Marshall Islands, eastern Micronesia have demonstrated sustained human occupation there for over two millennia. Here, we present a fine‐grained analysis of mollusc remains from four recently excavated archaeological sites (4476 total MNI / 14843 total NISP) combined with mapping and analysis of extant benthic habitats, on Ebon Atoll, Marshall Islands. We examine spatial and temporal variability in mollusc foraging practices from prehistoric village sites and ephemeral camp sites across the windward–leeward exposure gradient. Our analysis demonstrates that foragers targeted a rich assemblage of taxa from different habitats, reflecting a foraging strategy that was adapted to local environmental conditions. Human foraging over 2000 years documented no observable human impacts to molluscs or nearshore intertidal marine ecosystems, challenging previous notions of atolls as marginal, exceptionally difficult settings for human habitation.