Royal Flying Doctor Service: Mundi Undi Fun Run strips off to help doctors

The event attracts all types - the big, the small, the athletic, and those who wear little more than what they were born with.

Held in Broken Hill in Western NSW, the fun run is part of the annual Mundi Mundi Bash which brings music to the outback.

Some of Australia's biggest music acts are taking to the stage during this year's three-day festival, including Midnight Oil, Missy Higgins, Kasey Chambers, Daryl Braithwaite and The Black Sorrows.

But it's not all about the music, with the Mundi Undi Fun Run a much-loved and giggle-worthy highlight on the festival calendar.

Held on Friday morning, when the mercury was a chilly seven degrees, the spectacle attracted big, small, frilly and furry undies of all descriptions.

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One brave soul was spotted wearing a Borat-style fluorescent green mankini.

More than 640 runners took part in the one-kilometre run which raised almost $10,000 for the Royal Flying Doctor Service.

The festival opened on Thursday night with Midnight Oil and Missy Higgins joining forces on stage.

The spectacular Mundi Mundi Plains is where Midnight Oil filmed their legendary Beds Are Burning and Diesel and Dust film clips

The Mundi Mundi Bash continues on Saturday evening with performances by Jon Stevens, the Rolling Stones Review Starring Adalita, Tex Perkins and Tim Rogers, The Black Sorrows, Sarah McLeod, Eurogliders, Mick Thomas and Melanie Dyer.

The festival closes on Sunday night with headline performances from Jimmy Barnes and Kasey Chambers.

Find out more about the Royal Flying Doctor Service and make a donation at www.flyingdoctor.org.au.