Configuran uno de los paisajes más bellos de toda la región y constituyen un lugar ideal para el estudio del glaciarismo cuaternario. Situados en el extremo norte de la Provincia, en los términos municipales de Espinosa de los Monteros y Merindad de Sotoscueva. La vegetación presenta endemismos y especies boreoalpinas. Domina el praderío y podemos encontrar también bosques de hayas, robles y abedules. Pito negro, gavilán, búho real, buitre leonado, perdiz pardilla, lirón gris, nutria, gato montés, lobo.
El macizo de Castro Valnera es una de las elevaciones más destacadas entre la Cordillera Cantábrica y los Pirineos. Desde el punto de vista litológico, existe una gran variedad y contraste entre las crestas calcáreas o las grandes extensiones de lapiaz y las lomas silíceas cubiertas de pastizal o matorral. En algunos puntos, los estratos calizos y silíceos alternan de manera regular, dando una fisonomía muy particular al macizo, que se eleva en terrazas sucesivas y da lugar a interesantes contrastes. Ejemplos de relieve glaciar.
Localidad:
Espinosa de los Monteros
Las Machorras
Tipo de protección:
Red Natura 2000
REN:
Si
Fase de declaración:
Los Montes de Valnera se encuentran inlcuidos en la Red Natura 2000
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