Hill walkers are being recruited for a charity event to place someone on the summit of every mountain in the UK and Ireland more than 3,000ft high.
The challenge will include Munros like Ben Nevis
The 2007 WaterAid Munro Challenge is set to take place on 9 June.
It aims to raise money for safe water, sanitation and hygiene education projects for some of the world's poorest people in Asia and Africa.
Teams of people are needed on all the summits of Scotland's Munros and peaks in England, Ireland and Wales.
This year's challenge could see the total raised from the event since 1995 reach more than £1m.
The project, backed by the UK water industry, requires teams of between four and seven to be at the top of their chosen peak between 1200 BST and 1400 BST.
Companies and groups can also sponsor a mountain.
Dave Whiteley, chairman of the Munro Challenge steering group, said the 303 mountains include all 284 Munros in Scotland, as well as four in the Lake District, eight in north Wales and seven in the Republic of Ireland.
"It's a great day out and enables people to fulfil a personal challenge of climbing mountains in some of the country's most spectacular countryside," he said.
"At the same time they are raising money which will help people on the other side of the world to enjoy better access to one of life's basic needs - water."