This study evaluates the driving factors behind landscape diversity. A model for assessing the contribution of three factors (topo-climatic entropy, lithological diversity and human management) to landscape diversity is proposed. The model was tested in Navarra (northern Spain), a region with a long history of human settlements and distinct management practices, from mountain communities to cropland systems.  Variance of landscape diversity was divided into environmental and human fractions. A Generalised Additive Model was used to evaluate the effect of natural factors in a GIS  framework using non-human factors only. The statistical model accounted for 65% of total deviance (P < 0.005). The residuals retained were used to assess whether the non-explained deviance could be interpreted as human influence. The mountain-valley transition showed different diversity than the potential diversity produced by natural factors.  This finding is explained by the high levels of landscape diversity caused by traditional land management practices in the mountains and the homogenisation of lowlands caused  by recent human activities. Residuals and distance to main mountain range, the Pyrenees, were highly correlated, (r2 = 0.68; P < 0.005). Positive residuals were located in areas closer to mountains while negative ones were found in lowland croplands. This result validates the interpretation of non-explained deviance as a human effect on landscape diversity. Our approach could be used, for example, in multi-temporal evaluations of landscape diversity or to relate the spatial distribution of Human Induced Diversity (HID) to landscape indexes.