A solid edge along the water makes cargo work possible. A quay is a solid, usually stone or concrete, platform built along the edge of a harbor or river, where ships berth to load and unload.

Unlike a pier, a quay typically runs parallel to the shore and presents a continuous face. Bollards, fenders, crane rails, and warehouse sheds are common fittings. Depth alongside and length of the quay wall determine the ships that can use it.

Quay construction must resist ship impact, tidal forces, and the weight of cargo and equipment. Maintenance of the face, coping, and services is a continuous port expense. Many older quays have been strengthened or rebuilt to accept larger modern ships.

• Solid platform along the water for berthing ships
• Usually parallel to the shore
• Equipped with bollards, fenders, and cargo gear
• Depth and length limit usable ship size