The special characteristics of the Designation of Origin (DO) Sierra de Segura come from high mountain olive groves, with altitudes above 900 meters and a is limited, poor and very surface soil. In lot of cases, the soil is made up by the exclusive decomposition of the bedrock. This factors are combined with a rather irregular climatology, which produces a lot of ups and downs of temperature, and with a medium rain upper than the average of the province of Jaén (located at the south of Spain), which produce an exclusive microclimate which gives a special olive oil of the Picual variety, the majority variety of the province of Jaén.