The 6 Inch Trail Marathon on 21 December 2025 is an annual 46km ultra marathon race from North Dandalup to Dwellingup in Western Australia.

The 47km running event covers a small section of the 1000km long The Munda Biddi Trail (which means path through the forest in the Noongar Aboriginal language) and fast becoming a world class cycle trail. With this in mind the wide trails have been shaped nicely for runners to get into a rhythm and enjoy the unspoilt bushland and shade of towering eucalyptus trees.

There is also a 23km 'half' distance event.

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