Sumarpo

Nene Valley Swimrun Festival

Sibson Lake, 

31 Great North Rd, Stibbington 

PE8 6LS

Saturday 7th June 2025

5k Fenland Runner Intro Solo Swimrun

PRE RACE SUPPER

Sunday 8th June 2025

Sprint 10k Monkey Sox Solo Swimrun

Half 21k Swim Secure Solo Swimrun

Half 21k Swim Secure Team Swimrun

Full 31k Precision Hydration Solo Swimrun

Full 31k Precision Hydration Team Swimrun

Saturday brings our 1st swimrun of the season in the Fenland Runner Intro 5k race.

The epic sprint 10k solo, Half 21k solo, Half 21k team, Full 31k solo and Full 31k team Swimrun races are early on the Sunday.

All are welcome to join us for our pre race Supper at 7pm on Saturday!

We are extremely fortunate to have the kind support from from Castor Parish Council, Alwalton Parish Council, Stibbington Parish Council, Yarwell Parish Council, Yarwell United Charities, Elton Hall, Sutton Parish Council Elton Parish Council Fotheringhay Parish Council Nassington Parish Council, Wansford Parish Council and all the local landowners. Without their support we just wouldn't have such an amazing course through all this beautiful countryside and local villages. 

The swimming for all distances is on the beautiful River Nene.

The run sections for the 5k and 10k are predominantly flat, off road with tracks, field and compact trail.  The run sections for the 21k and the 31k are more undulating and take you down in the valley on a scenic but challenging river adventure with upstream and downstream swimming on the most beautiful and clean sections of the River Nene.

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 0820hrs  Registration Opens.
• 0830hrs  Race Start 39k 
• 0830hrs  Race Start 21k 
• 1100hrs  Race Start 10k TBC

PRICING

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

• Full 31k solo Early bird until 30th April £155

      From the 30th April £175



• Full  39k team £300

       From the 30th April £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 0800hrs

Splits

Run 1 4600m

Swim 1 950m upstream

Run 2 2180m

Swim 2 400m downstream

Run 3 2400m

Swim 3 950m upstream

Run 4 2550m

Swim 4 950m downstream

Run 5 1100m

Swim 5 350m downstream

Run 6 3600m

Swim 6 700m upstream 

Run 7 2700m

Swim 7 175m downstream

Run 8 3800m

Swim 8 700m upstream

Run 9 1400m 

Swim 9 285m upstream

Run 10 975m

Swim 10 30m

Run 11 50m

Camping

Camping is available at this venue please book below