Saudi Arabia is served from two different coastlines — Jeddah on the Red Sea side, and Dammam (King Abdul Aziz Port) on the Gulf side — and the choice between them depends mainly on the cargo's final destination within the kingdom, since inland trucking distance from each gateway varies considerably for a country of Saudi Arabia's size.
SASO (Saudi Standards, Metrology and Quality Organization) conformity assessment is the compliance step that most distinguishes Saudi-bound shipments from many other markets: many product categories require a SASO Certificate of Conformity, obtained through an accredited conformity assessment body, before the shipment is even dispatched — this is a pre-shipment requirement, not something resolved at the port on arrival.
Shipments lacking the correct SASO certification, or carrying one that does not match the actual goods and HS code shipped, are a common cause of hold at Saudi customs, which makes confirming SASO status before booking as important as confirming any other customs document for this particular market.
The Gulf region more broadly runs similar conformity-assessment-before-shipment regimes under its own GSO (Gulf Standardization Organization) framework, so an importer shipping into multiple Gulf states should expect to manage a comparable certification step for each destination rather than assuming one certificate covers the whole region.