The reconstructed Old High German name of Aargau is Argowe, first unambiguously attested (in the spelling Argue) in 795. The term described a territory only loosely equivalent to that of the modern canton, including the region between Aare and Reuss rivers, including Pilatus and Napf, i.e. including parts of the modern cantons of Bern (Bernese Aargau, Emmental, parts of the Bernese Oberland), Solothurn, Basel-Landschaft, Lucerne, Obwalden and Nidwalden, but not the parts of the modern canton east of the Reuss (Baden District), which were part of Zürichgau.