16Despite the extensive archaeological surveys carried out in the last decades, little attention has been paid to 17 one of the longest water supply systems of ancient times -the Byzantine water infrastructure which fed 18Constantinople from the mid-late fourth century AD. This work uses modern satellite terrain data and 19Global Positioning System (GPS) data to assess this system and provide an improved description of its 20 route, total length and gradient profile. 44 validated GPS Control Points were correlated with ASTER 21 GDEM V2 digital satellite data and archaeological information in a Geographic Information System (GIS) 22 environment. We concluded that the total length of the water supply system was 426 km, and possibly even 29Keywords

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