increasing number of Nabataean cultural heritage is being exposed to environmental impact. A central issue is the management of water impacting the built heritage and the rock hewn facades. The large number of discoveries and the exposure of structures and findings demand conservation measures respecting the interlinkage between the natural landscape and cultural heritage, as especially this connection is a central challenge at the UNECSO World Heritage Site. Conservation of cultural heritage In recent years different conservation campaigns and projects were established at the cultural heritage site of Petra. The main works first focussed on the entrance situation of the Siq to protect tourists and to facilitate access. Also, different projects for conservation and conservation research were conducted. Following is a list of projects, to be continued. 1958 Restoration of the third pillar of the Treasury building (Al-Khazneh). This project was funded by the United States Agency for International Development (USAID) 1974–1990 Conservation work in the excavated area of the Winged Lions Temple 1981 Different restoration works by the Department of Antiquities of Jordan 1985 Restoration works at the Qasr El Bint Temple by the Department of Antiquities of Jordan 1990–1998 Excavation and Conservation of the Byzantine Church by the American Centre of Research (ACOR) 1992–2002 Conservation and Restoration Center in Petra CARCIP, German GTZ Project. 1993–2000 Excavation, conservation and restoration of the Great Temple, funded by the Brown University, USA. 1996 onwards, Restoration of the Siq and rehabilitation of the Siq floor by the Petra National Trust foundet by the Jordanian-Swiss counterpart Fund, the Swiss Agency for Development and the World Monuments Fund. 2001 Restoration of the altar in front of the Casr Bint Firaun by UNESCO 2003 Development of a conservation and maintenance plan of the ancient drainage systems to protect the rock-cut facades 2003–2017 Evaluation of desalination and restoration at the tomb facades 2006–2010 Preservation and consolidation of the Wall Paintings in Siq al Barid by the Petra National Trust in cooperation with the Department of Antiquities of Jordan and the Courtauld Institute of Art (London). 2009 onwards, renewed effort to preserve and rehabilitate the Winged Lions Temple by The Temple of the Winged Lions Cultural Management (TWLCRM) Initiative, the Petra Archaeological Park (PAP) and the Department of Antiquities of Jordan 2016–2019 Characterisation and Conservation of Paintings on Walls and Sculpture from Nabataean Petra "The Petra Painting Conservation Project (PPCP)", funded by the German Research Foundation (Project