Sumarpo

Nene Valley Swimrun Festival

Sibson Lake, 

31 Great North Rd, Stibbington 

PE8 6LS

Saturday 7th June and Sunday 8th June 2025

The Nene Valley Swimrun Festival

We’re excited to launch our 2025 season this weekend with the Fenland Runner Intro 5K Swimrun taking place on Saturday — a perfect way to dip your toe into swimrun and soak up the atmosphere.

Then on Sunday, it’s time a full day of epic adventure across multiple distances:

• 🏃‍♂️ Sprint 10K Solo
• 🏃‍♀️ Half 21K Solo & Team
• 🏃‍♂️ Full 31K Solo & Team

No matter your level, there’s a challenge waiting for you!

Join Us for the Pre-Race Supper – Saturday at 7PM

Come and share a relaxed evening with fellow racers, volunteers, and organisers before the big day. All are welcome — it's the perfect chance to meet your swimrun community and fuel up for race day.

A Big Thank You to Our Local Supporters

We are incredibly grateful for the generous support of the local parishes and landowners, including:

Castor, Alwalton, Stibbington, Yarwell, Sutton, Elton, Fotheringhay, Nassington, and Wansford Parish Councils,
Yarwell United Charities, and Elton Hall.

Their cooperation and kindness are what make it possible for us to deliver such a stunning course through some of the most beautiful countryside and villages in the region.

 The Course:

All swim sections take place in the gorgeous, clean waters of the River Nene, with both upstream and downstream sections adding variety and adventure.

• 5K & 10K races feature flat, off-road runs along compact trails, field paths, and quiet tracks
• 21K & 31K races take you deeper into the valley on a more undulating route, delivering a true endurance test paired with some of the most scenic stretches of river you'll ever swim.

We can't wait to welcome you to the start line for a weekend full of challenge, community, and outdoor adventure.

See you in the valley!

Our Intro 5k Swimrun race consists of approx.

1125m of open water swimming and 3910m of mixed terrain running. 4 swim sections 5 run sections.  Longest run 1800m Longest swim 500m

Our Sprint 10k Swimrun race consists of approx.

2155m of open water swimming and 7850m of mixed terrain running  5 swim sections 6 run sections. .Longest Run 3000m. Longest swim 700m 

Our Half 21k Swimrun race consists of approx.

4430m of open water swimming and 17550m of mixed terrain running. 7 swim sections 8 run sections. Longest run 4000m. Longest swim 1775m

Our Full 31k Swimrun race consists of approx.

6000m of swimming and 25000m of mixed terrain running.  11 swim sections 12 run sections. Longest Run 4800m. Longest swim 1000m

            SCHEDULE             

(subject to change)

Saturday 7th June

• 1615hrs Mandatory Race Safety Brief 5k Intro
• 1630hrs Race Start 5k Intro
• 1835hrs Mandatory Race Safety Brief for 10k, 21k and 31k**

   **Race Safety Brief for the 10k, 21k and 31k is in your Racebook for those unable to attend this brief.

       It is a Mandatory Requirement to read the Racebook or attend this safety briefing.

• 1900hrs  PRE RACE SUPPER

Sunday 8th June   

• 0645hrs to 10.45hrs  Registration Opens.
• 0830hrs  Race Start 39k 
• 0830hrs  Race Start 21k 
• 1100hrs  Race Start 10k

PRICING

• Intro 5k solo  £35 
  
• Sprint 10k solo  £55 
  
• Half 21k solo  £105 
• Half 21K team  £205 
  
• Full 31k solo  £175
  
• Full  31k team  £350

         No extra fees at checkout

THE COURSES

5k Solo Swimrun Course   

Saturday 7th June 2025

Start time 1630hrs

Splits

Run 1 400m

Swim 1 500m downstream

Run 2 800m 

Swim 2 275m downstream

Run 3 860m

Swim 3 150m

Run 4 1800m

Swim 4 200m

Run 5 50m

Course Details

Distance  5.116 km 

Ascent/Descent  5 m / 6 m

Uphill  1.08 km (21.1%

Downhill  0.81 km (15.8%)

Flat  2.97 km (58.1%) 

Height Gain  4 m 

Steepest Uphill +0.7% (at 0.00 km) 

Steepest Downhill  -1.1% (at 0.27 km)

Longest Uphill  0.81 km (at 3.24 km)

Longest Downhill  2.97 km (at 0.27 km)

 10k Solo Swimrun Course 

Sunday 8th June 2025

Start time 1100hrs TBC

Course Details

Distance 21.738 km 

Ascent/Descent 76 m / 75 m 

Uphill 6.75 km (31.1%) 

Downhill 6.21 km(28.6%) 

Flat 8.64 km (39.7%) 

Height Gain 30 m

Steepest Uphill+3.3% (at 1.08 km) 

Steepest Downhill-5.2% (at 2.43 km)

Longest Uphill 2.70 km (at 18.63 km)

Longest Downhill 1.62 km (at 4.32 km

Water/Aid Stations at 7.8k and 15.8k

Cut off into any water at 1300 hrs

Full 31k Solo & Team Swimrun Course

Sunday 8th June 2025

Start time 0830hrs

Splits

Run 1 4600m

Swim 1 975m upstream

Run 2 2500m

Swim 2 450m downstream

Run 3 2400m

Swim 3 950m upstream

Run 4 3240m

Swim 4 350m downstream

Run 5 850m

Swim 5 470m downstream

Run 6 3600m

Swim 6 700m upstream 

Run 7 2700m

Swim 7 175m downstream

Run 8 3800m

Swim 8 740m upstream

Run 9 1400m 

Swim 9 285m upstream

Run 10 975m

Swim 10 280m upstream

Run 11 50m

Camping

Camping is available at this venue please book below