Our pledge is to trek 25 km across the Capital. We will start at Putney Bridge, then head East towards the City, zig-zagging over 16 historic bridges in SUB 5 HOURS

https://www.ultrachallenge.com/thames-bridges-trek/the-route/

Médecins Sans Frontières / Doctors Without Borders (MSF) is the world's leading medical humanitarian aid organisation.

They provide emergency assistance to people affected by armed conflict, epidemics and natural or man-made disasters, without discrimination and irrespective of race, religion, gender or political affiliation.

They work in over 70 countries and go to the places where others cannot or choose not to go.