Assab's port defines the city. It is the reason the town exists, the reason Italy developed it during the colonial period, and the reason its decline after the Eritrean-Ethiopian war hit so hard. Today the docks still operate, handling cargo for Eritrea's southern region and some transit traffic, but the scale is a shadow of what it was.
Walking along the waterfront gives you a sense of the place — the Red Sea is vivid blue even in the crushing heat, the air smells of salt and diesel, and the harbour infrastructure speaks of an earlier era of ambition. The port area is not generally open to tourists but the waterfront road is accessible and offers good views of the bay.