Territory and Ontology: social being and the ontogenetic mediation of space, the author takes on one of the central problems of contemporary geographic thought: the theoretical trivialisation of territory. Rejecting readings that reduce it to metaphor, identity, or a tool of governance, the text proposes a radical turn, returning territory to the plane of the ontology of social being. Grounded in historical-dialectical materialism, the book shows that territory is neither a foundational category nor an explanatory subject, but rather a social form historically produced through socio-spatial practices, class struggle, and the mediations of the State, property, coercion, and consensus. In critically revisiting both classical and contemporary geographical traditions, the author articulates ontology, critique of political economy, and territorial analysis, while rigorously incorporating the determinations of class, race, and gender. This is a theoretical work aimed at those who understand territory not as a description of the world, but as a critical problem of social reproduction and of the concrete possibilities of emancipation.