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20The continental margin of southern South Africa exhibits an array of emergent marginal marine 21 sediments permitting the reconstruction of long-term eustatic sea-level changes. We report a 22 suite of optical luminescence ages and supplementary amino acid racemization data, which 23 provide paleosea-level index points for three sites on this coastline. Deposits in the Swartvlei and 24Groot Brak estuaries display tidal inlet facies overlain by shoreface or eolian facies. 25Contemporary facies relations suggest a probable high stand 6.0-8.5 m above modern sea level 26 (amsl). At Cape Agulhas, evidence of a past sea-level high stand comprises a gravel beach (ca. 27 3.8 m amsl) and an overlying sandy shoreface facies (up to 7.5 m amsl). OSL ages between 138 28 ± 7 ka and 118 ± 7 ka confirm a last interglacial age for all marginal marine facies. The high 29 stand was followed by a sea-level regression associated with the accumulation of eolian dunes 30 dating to 122 ± 7 ka to 113 ± 6 ka. These data provide the first rigorous numerical age 31 constraints for last interglacial sea-level fluctuations in this region, revealing the timing and 32 elevation of the last interglacial high stand to broadly mirror a number of other far-field 33 locations. 34 36Final version available at