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

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 BCE, 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. Particular attention is given
to breakwaters, entrance channels, slipways/shipsheds, and large wavetrap
systems designed to mitigate dominant north-westerly seas. Finally,
we examine how tectonic uplift and subsidence, rather than glacialisostatic
effects, drove major relative sea-level change, submerging
substantial parts of the port and complicating the archaeological record.