Skookumchuck Narrows forms the entrance of Sechelt Inlet on British Columbia's Sunshine Coast in Canada. Before broadening into Sechelt Inlet, all of its tidal flow together with that of Salmon Inlet and Narrows Inlet must pass through Sechelt Rapids. At peak flows, whitecaps and whirlpools form at the rapids even in calm weather. The narrows are also the site of a Skookumchuk Narrows Provincial Park.
Each day, tides force large amounts of seawater through the narrows—200 billion US gallons (760,000,000 m3) of water on a 3-metre (9.8 ft) tide. The difference in water levels on either side of the rapids can exceed 2 metres (6.6 ft) in height. Current speeds can exceed 16 knots (30 km/h), up to 17.68 knots (32.74 km/h). Although it is sometimes claimed to be the fastest tidal rapids in the world, Norway's Saltstraumen reaches speeds of 20 knots (37 km/h).
The tidal patterns keep the water moving at virtually all times in the narrows area, which attracts a plethora of interesting sea life.