The Early Bronze Age in third-millennium-BC Eastern Arabia was a period of fundamental change, which is apparent in the development of social complexity, the exploitation of new resources and the emergence of new modes of life. Hallmarks of this period include monumental structures, so-called towers, and stone-built circular tombs. The second volume of the series Arabia Orientalis is dedicated to the archaeological investigation of the Early Bronze Age necropolises of the UNESCO world heritage sites Bat and Al-Ayn in the Sultanate of Oman, as well as the monumental tower structure Building II at Bat. It encompasses detailed reports on the architecture and stratigraphy, as well as the find assemblages from the excavated buildings, including pottery and small finds, along with anthropological as well as anthracological studies. The publication presents insights into changing burial customs, as well as the function of the monumental tower structures. Three out of the four excavated Hafit- and Umm an-Nar-period tombs in the necropolises featured evidence for reuse at later times, especially during the Samad period, where new inhumations were placed into the Bronze Age tombs. The early Umm an-Nar tower Building II is surrounded by a large ditch system that |