Every serious Pacific Coast sailor has Desolation Sound on their list. Not the way certain destinations accumulate on lists — in a vague, someday way — but as an actual plan, with a rough season and a vessel in mind. The reputation gets there first, and then someone who’s been there tells you about anchoring in Prideaux Haven with the water temperature at 24°C and a mountain rising from the waterline, and the list becomes something more urgent.
Desolation Sound Marine Park sits on the British Columbia mainland coast, roughly 100 nautical miles north of Vancouver and 80 nm north of Nanaimo. It is the largest marine park in BC — 8,449 hectares of fjords, islands, inlets, and passages. It has no roads. The only access is by water or floatplane.
Why the Water Is Warm
The sea surface temperatures in Desolation Sound are anomalous. The Pacific Coast has cold water — San Francisco, Monterey, even the San Juans are too cold for comfortable swimming without a wetsuit most of the year. Desolation Sound has 24°C (75°F) water in July and August, warm enough that people swim off their boats, wade at anchorage shores, and kayak in shorts.
The reason is simple geography. The sound is a semi-enclosed basin with long water residence times — the water that enters in spring warms steadily through summer without being flushed by the cold upwelling that affects open coast locations. The combination of deep fjords and minimal tidal exchange in the inner coves produces water temperatures that feel more like the Mediterranean than the North Pacific.
This warmth makes Desolation Sound fundamentally different from other BC anchorages. You swim here. You stay longer. The anchor goes down and days start accumulating in a way that doesn’t happen elsewhere.
Getting There: The Passage North
The direct route from the Gulf Islands or Vancouver to Desolation Sound runs north up the Strait of Georgia — open water sailing, northwest winds building through summer afternoons, the Coast Mountains as the horizon. From Nanaimo to the entrance of Desolation Sound is approximately 80 nm. Most boats do this in two days, with an overnight stop in Comox (28 nm north of Nanaimo, full services) or Campbell River (55 nm north, the last full-service marina).
Seymour Narrows: The Critical Passage
The passage from the Strait of Georgia into the Discovery Islands and northward requires transiting Seymour Narrows — the 15-knot tidal rapids between Vancouver Island and Quadra Island. This is not a passage to take casually.
Maximum current at Seymour Narrows reaches 15 knots. At this speed the water surface becomes chaotic — standing waves, whirlpools, a generally unpleasant sea state for any vessel not making good way against it. The passage becomes routine with correct timing: plan your transit within 30 minutes of slack water, use the CHS current tables specifically for Seymour Narrows (don’t use the main Strait of Georgia tables), and arrive early to assess conditions.
Practical approach: Most northbound boats stop at Campbell River specifically to calculate the Seymour Narrows window. There are two slack periods per day; choose the one that fits your schedule and plan accordingly. The current direction changes quickly — you want to be through the narrows before the flood or ebb establishes itself.
Once through Seymour Narrows, the Discovery Islands open up: Quadra Island, Cortes Island, Redonda Island, and dozens of smaller passages leading into the sound.
The Anchorages
Prideaux Haven
Prideaux Haven is the most famous anchorage in Desolation Sound and probably the most talked-about anchorage on the Pacific Coast. It sits at the northeast corner of Malaspina Inlet — a complex of interconnected coves, passages, and islets where an anchorage that looks full at noon can accommodate another six boats by evening.
The water is warm. That’s the first thing. Boats arrive in Prideaux Haven and people go swimming before the anchor is fully set. It sounds like a small thing, and then you realise you’ve swum every day for four days.
The second thing is the stern-tie culture. Prideaux Haven is crowded in summer — 30 to 40 boats in the inner coves on August weekends — and the practice of dropping a bow anchor and running a stern line to shore keeps the anchorage functional. If you’ve never stern-tied a boat, Prideaux Haven is where you’ll learn. Your neighbours will help.
Logistics: No services. Bring everything you need. The holding is excellent in mud at 15–50 feet. Plan to stay at least two nights.
Squirrel Cove, Cortes Island
Squirrel Cove is a large, well-protected bay on the west side of Cortes Island with a small general store ashore — the only provisioning point in the inner sound. A First Nations settlement and a handful of permanent residents maintain the store. Eggs, some canned goods, beer, ice cream on good days.
The anchorage is excellent — a wide bay with good holding in mud, mooring buoys maintained by the Klahoose First Nation, and enough room for a large fleet. From Squirrel Cove, Prideaux Haven is 10 nm; Refuge Cove is 12 nm; the whole sound is within a day’s sailing.
Refuge Cove, West Redonda Island
Refuge Cove is the nearest thing to a supply stop inside the sound proper. A small store sells diesel (at Sunshine Coast prices, which is to say: more than you’d like but less than being without fuel), propane, ice, basics. The dock sells fresh Dungeness crab when available. The float is first-come, first-served; the anchorage outside is large and well-protected.
For boats planning a week or more in the sound, Refuge Cove is a natural midpoint stop.
What to Plan For
Wind in Desolation Sound: The sound is generally calm. It is not a sailing destination in the usual sense — in July and August, winds inside are light and variable. Most boats motor in the sound itself, saving their sails for the Strait of Georgia passage. Northwest winds occasionally funnel down the mainland inlets, and Homfray Channel in particular can produce gusty conditions; check the local forecast.
Weather: July and August are the reliable months. June has the highest chance of rain and unsettled weather but also the most snowmelt — Prideaux Haven in June with full waterfalls running off every cliff is extraordinary. September brings shorter days and a higher probability of northwest fronts, but also fewer boats.
Charts: CHS 3538 (Desolation Sound) and 3311 (Gulf Islands and Howe Sound to Desolation Sound — a passage chart). The CHS app has these digitally. Paper charts for Prideaux Haven and Squirrel Cove are worth carrying — the inner passages require close attention.
Provisions: Provision fully before entering the sound. Campbell River has a Superstore and complete marine stores. Comox is well-provisioned and less hectic. Once inside, Squirrel Cove and Refuge Cove cover emergencies, not menu planning.
The Right Amount of Time
A week is the minimum to experience Desolation Sound properly. Two weeks is better. Three weeks or more is what people who can manage it actually do.
The pattern that works: one day north from Nanaimo to Campbell River, Seymour Narrows transit the following morning, two or three nights in Prideaux Haven or the inner coves, a stop at Squirrel Cove and Refuge Cove, and the return passage timed to the next Seymour Narrows slack. That’s a 10-to-12-day trip that fits into most reasonable vacation windows and covers the essential ground.
The boats that stay three weeks are not wasting two weeks. They’re finding the coves that don’t appear on the recommended lists. They’re anchoring in rain and sun both, learning what the sound is actually like rather than what it is in photographs. They’re doing the thing that Desolation Sound rewards more than anywhere else on the Pacific Coast: staying long enough to stop rushing.
Eighty nautical miles north of Nanaimo. A week minimum. The water is warm.