Frenchman Peak was named by surveyor Alexander Forrest during an expedition in search of good country for pasture in 1870. The peak’s shape was thought to resemble the hats worn by French troops in the 1800s.
A large cave near the summit is thought to have formed by wave action and underwater currents during a period some 40 million years ago when sea levels were at least 300 metres above their current level and the peaks of Cape Le Grand were largely submerged.
The Aboriginal name for the peak is Mandooboornup and it is an important place in local Aboriginal culture.
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