Canada's Longest Open Water Swim Est.2022

Entering Our Second year

The Big Effort Swim

Big Effort Swim Day

August 19, 2023

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How to Register

NOTE: We will be updating this registration flow when we open registration for 2023 as some steps have changed.

2. Choose a Distance You'd Like To Swim

3. Share your Pledge Page with Friends & Family

4. Fundraise and Swim Your Big Effort

5. Pledge Our Athletes

Conquer the lake - Marathon distances

NOTE: We will be updating maps and distances for 2023. Stay tuned.

Marathon Swim 36,000m

Our 36km Marathon Swim is the longest course available in Canada and is intended for experienced and elite swimmers with open water practice. This swim is not for the feint of heart and will test the endurance of its athletes. Swimmers will complete two lengths of Christina Lake with the support of kayakers, crew, and safety personnel. 

Half Marathon Swim 18,000m

The shortest of our ultra endurance swim distances, our 18km Half Marathon Swim will take swimmers across Christina Lake in a single effort. This swim is intended for experienced and elite swimmers looking for a big open water and endurance challenge with the support of kayakers, crew, and safety personnel.

Directions to Christina Lake, B.C., Canada

We acknowledge and respect that where this event is held and where we all live and work are within the converging ancestral, traditional and unceded territories of the Kootenay/Boundary and Columbia Basin Indigenous Peoples as well as the Metis Peoples whose footsteps have also marked these lands.

When: Held annually over the 3rd last weekend of August (Saturday).

Where: Christina Lake Provincial Lake, 140 Park Road, Christina Lake, British Columbia, Canada

About: Christina Lake is located in the Monashee Mountains near Grand Forks in the Kootenay Boundary Region of British Columbia, Canada and boasts the warmest water of any tree lined lake in Western Canada and is considered one of the cleanest lakes in Canada. It’s picturesque beauty make this a premiere destination for open water swimmers and wilderness enthusiasts. Come visit this summertime mecca and its quaint friendly community for an experience of a lifetime.

Directions: Christina Lake can be accessed via Hwy 3 from Osoyoos & Castlegar, Hwy 395 from Kettle Falls, WA, as well as other roads from Kelowna and the Okanagan area. It is about a 3 ½  hour drive from Kelowna, B.C., a 6 hour drive from Vancouver, B.C.,  a 7 ½ hour drive from Calgary, A.B., and a 2 hour drive from Spokane, WA.