Narrow Strait, historically known as Porte des Mortes or 'Death's Door', is the significant body of water that gives Door County its name. This strait connects Lake Michigan to Green Bay, running between the Door County mainland and offshore islands. The primary launch point for paddlers is the Garrett Bay kayak launch, which features a rocky limestone beach that can be slippery with algae. There is a $5 launch fee, with free parking available; trailers can be parked on wood chips, but no parking is allowed directly on the launch, though 15-minute loading and unloading is permitted. This launch is for non-motorized craft only. Paddling here can be challenging with northerly winds above 17 mph, indicating significant exposure and potential for rough conditions, especially given the strait's notorious history for treacherous waters.

The paddling routes offer scenic views, geology, and history. One standard route heads out and around Door Bluff, which is suitable for an easy paddle with beautiful views; paddlers with endurance can continue to Ellison Bluff, where the base is only accessible by boat. Another option is to paddle east toward Gils Rock and continue to the Northport ferry crossing to watch larger vessels, with the possibility of crossing to Plum Island or Washington Island. Notable sights include pictographs on the eastern backside of Door Bluff, trilobite burrows in the 400-million-year-old limestone bluffs, and the opportunity to tie up and hike up Door Bluff for expansive views. The area's character is adventurous and rich in natural history, set against a dramatic geological backdrop of ancient sea floors now formed into tall bluffs. Camping is available nearby at Newport State Park.