Ba Vi National Park is centred on Mount Ba Vi, at about 50 km west of Hanoi. The Ba Vi mountain rises steeply out of a plain that rarely exceeds 30 m in elevation. Mount Ba Vi has three peaks: the highest is Dinh Vua at 1,296 m, followed by Tan Vien at 1,226 m and Ngoc Hoa at 1,120 m. Because of the mountainous topography, the climate at Ba Vi varies with altitude. Above 500 m, fog enshrouds the top of the mountain on most days.