Every year the picturesque Wester Ross villages of Poolewe and Aultbea, together with surrounding Highland estates, play host to one of Scotland's most enduring and formidable sporting events for charity.

Now in its 21st year, the Great Wilderness Challenge (GWC) lives up to its name. In true wilderness – some of the most beautiful and rugged landscape in Scotland – the Challenge consists of physically demanding walks or races over a choice of distances and terrains.

There is a Challenge for all levels of ability and fitness and all ages – over seven miles, 13 miles or 25 miles; on well-marked lowland tracks and pathways or across remote mountains and wild glens, through rivers, bogs and open moorland.

From its beginnings as a small charitable event in 1986, the Great Wilderness Challenge has developed over the years into a major and much-loved Scottish fundraising phenomenon.

Supported by teams of marshals, medics, safety professionals and sponsors, up to 600 participants now undertake the Challenge each year and, to date, the GWC has raised more than £1.6 million for Scottish charities.

Participants in the Challenge are asked to raise at least £100 for the charities supported by the GWC. But such is the commitment, enthusiasm and sheer hard work of those taking part that the average amount raised per person now exceeds £300.

Thanks to those who participate and those who freely offer their support, the Great Wilderness Challenge has become a significant contributor to Scottish charitable organisations.