The "Triple R" approach on the restoration of dry stone walls, using recognizable, reversible and respectful constructive techniques, is here illustrated. A set of restoration procedures are explained and applied to a UNESCO World Heritage site in al-Baleed, (Salalah-Sultanate of Oman), placed in the "Land of Frankincense". The procedures were adapted in innovative way to take into account the climate features of the Indian Ocean area (Monsoon season). All the restoration procedures aimed at conserving the site's original architectural features by using only suitable stones and materials found on-site. Specific procedures have been adopted to consolidate walls, gates, foundations and sloping surfaces. Simple on-site mechanical tests and evaluation methods have been developed for a quick assessment of the safety level of the restored walls to ease future archaeological excavations.The application is related to a waterfront side of the ancient city built around ninth century C.E. and added to over the next five centuries. The mentioned restoration procedures allowed to perform further archaeological excavations with new findings here described.
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