Two cheques worth a total of €3,376,000, raised through the Climb with Charlie campaign, have been handed over to charity.
The Climb with Charlie initiative was set up by former RTÉ chief news correspondent Charlie Bird, following his diagnosis of motor neurone disease in November last year.
It saw Mr Bird set himself the goal of hiking to the top of Croagh Patrick in Co Mayo on 2 April.
It aimed to help and show support for those who have their own physical and mental mountains to climb.
In addition to Croagh Patrick, thousands of people took part in hundreds of other climbs across Ireland, with climbs also organised as far away as the US, Australia, South Africa and Spain.
The cheques - amounting to €1,688,000 each - were given to Irish Motor Neurone Disease Association Chief Executive Lillian McGovern and Pieta Chief Executive Stephanie Manahan at a ceremony in Merrion Square this morning.
The event was attended by Defence Forces Chief of Staff Sean Clancy, the Army Band 2 Brigade, RTÉ broadcaster Joe Duffy and several senior Defence Forces officers who took part in the Croagh Patrick climb.
"I want to thank people all across the country for their incredible support throughout this journey," said Mr Bird.
"All of the generous donations will go to the two charities which are so close to my heart. It is an amazing gesture of support for me and my family."
