"mountainous road" is a correct and usable phrase in written English.
It can be used to describe a road that goes through or over mountains, implying that the road is winding, steep, or difficult to traverse. Example: "We drove along the mountainous road, careful to navigate the sharp curves and steep inclines."
This mountainous road winds around the island's northeastern corner, affording views of crashing surf and, in autumn, dazzling forest colors.
There are police every 50 metres in Tashkent and dozens of roadblocks on the single mountainous road that leads to the Fergana valley, where Andijan is located.
Twenty female farmers were killed when the three-wheeled vehicle they were riding overturned on a mountainous road in Liaoning Province.
After a 40-minute drive up a mountainous road, she arrived at the man's home, a modest house of concrete blocks under a roof of corrugated zinc, in a small town called Nueva Era.
The shrine is on the highest hill in the town and approached either by the long, steep staircase or by a mountainous road that climbs from the valley to the church plaza.
But because of the long surrender process now under way, some of those leaders have fled along a mountainous road to an area near Imam-i-Rabat Imam-i-Rabat Imam-i-Rabat
This drive along the D936 on the French island begins in the small mountain town of Corte, and takes you along twisty mountainous roads, along the river Restonica, past pine forests, waterfalls and eventually descending to a valley with two glacial lakes.
Not every setting — like the mountainous roads of the Dominican Republic — was hospitable, but I carried on.
His team had already driven eight hours on one-lane mountainous roads and shaky bridges.
This paper analyses transport energy consumption of conventional and electric vehicles in mountainous roads.
On the way up the mountainous roads to the Aquiares site, in our old 1970s Land Rover full of traps and people, the brakes gave out.
