Alto de São Macário is a mountain peak at an elevation of 1.052m (3,451ft) above the sea level, located in the district of Viseu, in the Central Inland of Portugal.
Set high in the Maciço da Gralheira mountain range, the road to the summit is totally paved but pretty narrow and very steep. It’s called CM1123. The summit hosts a monastery (Santuario de São Macário) and communication facilities. From the top, you have an amazing view, especially when the weather is clear.
The road to the summit is very steep, hitting a 14% of maximum gradient through some of the ramps. Starting at Sul, the ascent is 9.3 km (5.77 miles) long. Over this distance the elevation gain is 812 meters. The average gradient is 8.73%.