Sierra de los ÃÂrganos () is a mountain range in the province of Pinar del RÃÂo, western Cuba. Along with the Sierra del Rosario, it is part of the Guaniguanico mountain range.
The Sierra is the western part of Guaniguanico and spans from Guane to the San Diego River, in the municipality of Los Palacios. The other municipalities including the range are Mantua, San Juan y MartÃÂnez, Minas de Matahambre, Viñales, Pinar del RÃÂo, Consolación del Sur and La Palma.
In the middle of the Sierra de los ÃÂrganos is located the Viñales Valley, a natural reserve and World Heritage Site. In the east it is the protected area of Mil Cumbres, located almost entirely in the Sierra del Rosario.