Cave Dale (sometimes spelt Cavedale) is a dry limestone valley in the Derbyshire Peak District, England. It is located at grid reference . The northern end of the dale starts at the village of Castleton where the valley sides are almost perpendicular and over in height. The dale rises gently after leaving Castleton for approximately before becoming steeper culminating in a fine viewpoint down the dale taking in Peveril Castle with Lose Hill behind (see picture). After the viewpoint the dale swings west and levels out with gentle gradients, becoming just a shallow depression as it peters out onto the open pastureland between Castleton and Chapel-en-le-Frith. Cave Dale was initially formed by glacial meltwater carving a deep narrow valley in the local soluble limestone. The river then found a route underground leaving a dry valley with caverns underneath. Later on the caverns below Cave Dale collapsed making the valley even deeper and gorge-like at the northern end. The Castleton entrance to Cave Dale had a narrow natural arch as recently as 200 years ago, a relic of the roof collapse. The lower slopes of the dale have large amounts of scree, frost on the higher limestone cliffs having caused the rock to shatter. Halfway up the valley is an outcrop of basaltic lava with a few small columns. A bridleway runs the entire length of the dale, part of the Limestone Way footpath which travels 80 kilometres from Castleton to Rocester in Staffordshire. Cave Dale is accessed through a narrow rocky opening almost from the centre of Castleton, and Peveril Castle is seen high up on the almost vertical western slopes. The Normans chose this site because the steep sides of Cave Dale gave a natural defence and good lookout. The chambers and caves of Peak Cavern run directly below Cave Dale and any small streams in the dale quickly disappear into the ground down limestone fissures and into the caverns beneath. Mineral veins can also be seen within the limestone of the dale. The cliffs at the northern end of Cave Dale are used by rock climbers and there are several routes in the Very Severe category. There are several small caves or old lead mines within the dale's limestone walls, one being larger than the rest with bars preventing access. Cave Dale's steep north-facing grassy slopes are damp and bryophyte-rich and are dominated by oat grass (Trisetum flavescent)