12 km
5:40 /km
Taff loop.
Photo · CardiffCity, flat, waterfront.
One of the UK's largest halves — castle to bay via the Taff.
Because moving beside water borrows its willingness; the current does part of the pacing for you.
Welsh crowds carry you — spend the last 5 km on their breath.
A gentle profile — the course rewards patience rather than power.
Kind shoulder-season conditions — mild mornings, arm-sleeves off by kilometre eight for most runners.
A warm regional start — clubs in matching kit, coffee vans, a local mayor with a microphone. Human-scale and unhurried.
Steady, generous local support along the main boulevards and finish straight; genuine strangers-turned-friends handing out orange slices in the suburbs.
Water sections between km 8 and km 14 thin the crowd — breathe long, let the current pace you.
Sealed city tarmac — closed to traffic on race day
The official road is fully sealed and step-free on race day. Handcyclists routinely start with the elite wave; strollers welcome in the shakeout events.
Bay walk, hot tea.




5:40 /km
Taff loop.
6:20 /km
Bute Park easy.
4:30 /km
PB half.
Soft, restorative · step-free, wheelchair friendly
Only forward · run with the land
Forest-grounded · deeper trails, longer days
Long, open lines · quiet lanes, long horizons
Shared maps · shared GPX engine · shared Soul Signature language. Whichever door you enter, the craft standard is the same.