Where Are Harbors Located? Coastlines, Bays, Estuaries

Harbors (natural or artificial) sit at the land–sea interface where vessels can shelter, load, and unload.

Geomorphic Settings

• Natural harbors: Drowned river valleys (ria) — Sydney, San Francisco, Rio de Janeiro. Fjords — Oslo, Vancouver. Lagoons — Venice. Barrier-island gaps — New York, Chesapeake Bay.
• Artificial harbors: Breakwaters, jetties, dredged basins — Rotterdam (Maasvlakte), Singapore (Tuas), Long Beach, Dubai (Jebel Ali).
• Estuarine ports: Tidal rivers — London (Thames), Hamburg (Elbe), Guangzhou (Pearl), Kolkata (Hooghly).

Site Selection Criteria

• Depth (≥ vessel draft + keel clearance).
• Shelter from prevailing wind/wave (fetch < 5 km ideal).
• Minimal littoral drift (avoids constant dredging).
• Hinterland connectivity (rail, highway, pipeline).
• Fresh water, power, labor pool.

Classification by Function

• Commercial (container, bulk, Ro-Ro, tanker).
• Fishing / small craft.
• Naval / coast guard.
• Marina / recreational.
• Inland (river, lake, canal) — e.g., Chicago, Duisburg, Wuhan.

Global Count

~4,500 commercial ports >100k DWT capacity (UNCTAD). Thousands more minor harbors.