Mount Mou'apu, also written Moua Pū, is 762 m in elevation and can be recognised by its iconic archway on it's eastern ridge and it's pyramid-like shape.
The three main ridges leading up to it's summit are steep and minor cliffs make the summit unreachable.
The soil is loose and the rock crumbly. On the eastern side, a curtin of rock can been seen between Mou'apu and Mou'aroa infocing the idea that it's impenetrable. On western side of the peak, Uufau Pass provides a crossing through the centre of the island.