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A Sea Kayak or touring kayak is a kayak developed for the sport of paddling on open waters of lakes, bays, and the ocean. Sea kayaks are seaworthy small boats with a covered deck and the ability to incorporate a spray deck. They trade off the maneuverability of whitewater kayaks for higher cruising speed, cargo capacity, ease of straight-line paddling, and comfort for long journeys.

Sea kayaks are used around the world for marine (sea) journeys from a few hours to many weeks, as they can accommodate one to three paddlers together with room for camping gear, food, water, and other supplies. A sea kayak usually ranges anywhere from 3.0–5.5 m (10–18 ft) for solo craft, and up to 7.9 m (26 ft) for tandem craft. Beam width may be as little as 53 cm (21 in), and may be up to 91 cm (36 in).

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