Around 80,00 people are expected to take part in Darkness Into Light events around Ireland and across the world today.
There are 170 walks, mostly in Ireland, for the fundraising event for Pieta House, the suicide intervention charity.
The first walk was at Bondi Beach in Australia and the last will be in Vancouver.
Around 10,000 people walked and ran 5 kilometres around the Phoenix Park in Dublin, the biggest of the events which start before dawn.
The fundraiser, which also includes sailing and kayaking events, is expected to raise beween €3m and €4m for Pieta House.
