From the beginning of the article:
It is a great pleasure to contribute to this volume in honour of Mogens Hansen, as it has been to collaborate with him and his team at the Copenhagen Polis Centre. The work which I have done with the Polis Centre has been on Arkadia and on Elis, separately, and has revealed that the interaction of these two regions along their common frontier needs comment. Some thoughts on the subject are therefore offered here, in a spirit of congratulation to Mogens.
The physical geography of the region did not separate sharply Arkadia from Elis. Mt. Erymanthos in northwestern Arkadia, rising as it does to 2221 metres, is a formidable obstacle, continuing to the southwest in such associated ranges as Mt. Lampeia, but farther south communications between Arkadia and Elis are easier. Mt. Pholoe, which is an irregular plateau rather than a mountain range, could be crossed without great difficulty, which explains the strategic importance of Lasion, situated on the eastern side of Mt. Pholoe towards the valley of the R. Erymanthos. More fairly easy routes connected Arkadia and Elis north and south of the R. Alpheios, the more southerly of these routes crossing northern Triphylia. In central and eastern Triphylia Mt. Minthe divided north from south, but there was again access from Arkadia to Elis south of Mt. Minthe across Arkadian Phigaleia and southern Triphylia. Thus, despite some obstacles, especially Mt. Erymanthos in the north, most of the border between Arkadia and Elis is not sharply defined by natural features.