A port for Cyrene: pre-colonisation coastal topography and rationale for early port buildings and construction at Apollonia

Abstract

Abstract English Apollonia on the Cyrenaican coast (eastern Libya) served for over 1,200 years as Cyrene’s harbour and naval base, sustaining trade and defence across the Mediterranean. Although activity at the shoreline predates Cyrene’s formal foundation in 631 BC, much remains unclear about the port’s earliest layout. This paper reassesses Apollonia’s initial harbour formation by combining the Cambridge underwater survey of 1958–59 with other published works and new drone imagery and recent underwater measurements (2025). We reconstruct the pre-settlement geomorphology of calcareous aeolianite (kurkar) ridges and islets and evaluate how Greek engineers exploited and reshaped this terrain through quarrying and rock-cut architecture. Attention is given to breakwaters, entrance channels, slipways/shipsheds and large wave-trap systems designed to mitigate dominant north-westerly seas. Finally, we examine how tectonic uplift and subsidence, rather than glacial-isostatic effects, drove major relative sea-level change, submerging substantial parts of the port and complicating the archaeological record.