Volume 1 of the series Arabia Orientalis presents the first comprehensive study of two Umm an-Nar (2700--2000 BC) burial pits from the UNESCO World Heritage site Bat in the Sultanate of Oman. They were excavated between 2010 and 2012 by the University of T bingen. Each burial pit represents one of the largest closed finds of the Early Bronze Age in the region. Finds largely include beads and other items of personal adornment, as well as pottery and human bones. Detailed typologies of all objects are the basis for in-depth statistical analyses of the different categories of finds and the reconstruction of burial customs at Bat. Furthermore, imports and imitations from other regions including the Indus Valley, Iran, and Mesopotamia illuminate Bat's foreign relations and integration into the interregional exchange and communication system. The interpretation of the unearthed human remains conducted by Steve Zauner offer, not only the number of individuals, sex, and age of the deceased, but also insights into lifestyle, diseases, and stress of the people in the past.