The Big Half is an annual road running event over the half marathon distance (21.1 km), held in central London, United Kingdom.
The event, first held in 2018, initially took place in early March, a few weeks before the London Marathon, but after the COVID-19 pandemic switched to dates in late August/early September.
They start near the north side of Tower Bridge on the Highway then run eastwards, including a stretch through the Limehouse Link tunnel, to the Canary Wharf district before returning through Wapping to cross Tower Bridge.
Runners then route through Bermondsey, Rotherhithe, Surrey Quays and Deptford to finish by the Cutty Sark in Greenwich.
[1] Finish area facilities are accommodated in the grounds of the Old Royal Naval College, the National Maritime Museum and Queen's House and in Greenwich Park.