Mount Yonaha is located approximately north of the capital of Okinawa Prefecture, Naha, and approximately east of the of Kunigami. Mount Yonaha is formed from schist, phyllite, and sandstone, and dates from the Tertiary period to the mid-Mesozoic era. Mount Yonaha appears to be a gentle slope, but its summit is surrounded by a series of complex valleys. It is the highest mountain on the island and the second highest in the prefecture after Mount Omoto in Ishigaki, Okinawa. Mount Yonaha is part of the Okinawa Kaigan Quasi-National Park, and is the highest mountain in the park. A paved mountain road extends from the village of Kunigami at the base of Mount Yonaha to the mountain summit. Mount Yonaha is also home to the largest waterfall on Okinawa Island, the Hiji Waterfall (). Mounta Yonaha, due to the effect of the Kuroshio Current, is almost always covered in fog.