Aleksander Doba was a Polish kayaker known primarily for his long voyages crossing oceans. In 2010 and again in 2013 he kayaked across the Atlantic Ocean westward under his own power. The two voyages were the longest open-water kayak voyages ever made. He was named 2015 Adventurer of the Year by National Geographic. In 2017 he completed an eastward kayaking trip across the Atlantic. He died while climbing Kilimanjaro after reaching the mountain summit.

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