The second season of archaeological study of the Dûmat al-Jandal oasis (Saudi Arabia) by the Joint Saudi-Italian-French Archaeological Project took place from October 7th to November 13th, 2011. Results obtained this year were signi cant, in particular the discovery of several Neolithic sites to the south of Dûma, that of a Nabatean ‘triclinium’ and the base of a presumably ‘Roman’ tower on the Western sector’s promontory. These discoveries lead one to consider the setting up of long-term collaborations with specialists from a number of fields (Prehistorian, pottery experts specializing in classical periods, archaeo-botanists, etc...) and induce new thoughts on the place of Nabatean and Roman culture in the region. They also enable one to consider the continuation of Saudi-Italian-French collaboration and future research, in an atmosphere of confidence and sharing.