Col de la Serena
Col de la Serena is a mountain pass at an elevation of 1.303m (4,274ft) above the sea level, located in the Alpes-Maritimes department in southeastern France. Be prepared. The road is very narrow. It’s not for the faint of heart or ill prepared.
The road to the summit is very narrow. It shouldn’t be attempted by those who don't know how to reverse. Its many twists, turns and narrows can pose a challenge to even the most experienced drivers. At the summit there’s a military fortress called Ouvrage La Séréna, part of the Maginot Line's Alpine extension.
The road is not easy, though. Up, down, right, left all the time. The road is pretty steep. Starting from M2565 road in La Roche, at 1.120m above the sea level, the ascent is 5.3 km long. Over this distance the elevation gain is 183 meters. The average gradient is 3.45%. Driving at night, or in poor visibility, is not recommended for drivers unfamiliar with the road.