Links
Biosecurity: http://www.nonnativespecies.org/checkcleandry/index.cfm
The Frog Graham Round: https://www.froggrahamround.co.uk/
The Paddy Buckley Round: https://en.wikipedia.org/wiki/Paddy_Buckley_Round
The Bob Graham Round: http://www.bobgrahamclub.org.uk/
Other ultra running challenges https://www.gofar.org.uk/
Event advice: https://www.snowdonia.gov.wales/__data/assets/pdf_file/0028/246736/Organised-Competitive-and-Charitable-events-document.pdf
Snowdonia National Park: https://www.eryri-npa.gov.uk/
The Countryside Code In Wales: https://naturalresources.wales/days-out/the-countryside-codes/?lang=en
The Wild Swimming Code: https://cdn.naturalresources.wales/days-out/the-countryside-codes/the-wild-swimming-code/?lang=en
Natural Resources Wales: www.naturalresourceswales.gov.uk
Better value train travel: https://www.splityourticket.co.uk/
Personal Location Beacons: http://www.mountainsafety.co.uk/EP-PLB.aspx
Snowdon Inn: https://www.thesnowdoninn.co.uk/
Love SwimRun Llanberis: http://loveswimrun.co.uk/love-swimrun-llanberis/
We Swim Run: https://www.weswimrun.org/
The Outdoor Swimming Society: https://www.outdoorswimmingsociety.com/
Breca Gower: https://www.brecaswimrun.com/breca-gower
The Fellrunners Association: https://www.fellrunner.org.uk/
The Welsh Fellrunners Association: http://www.wfra.me.uk/
Snowdonia Watersports; https://snowdoniawatersports.com/
Wild swim walks in Snowdonia: https://www.thebmc.co.uk/5-of-the-best-wild-swim-walks-in-snowdonia
English (UK) 
Cymraeg