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Gasr el-Gezira stands on high ground about one kilometre south of the edge of the escarpment overlooking Wadi el-Matmùra where it debouches on to the Gefara, the coastal plain of Tripolitania, and about four kilometres due north of kilometre-stone 166 on the Jefren—Giado road. The escarpment in the neighbourhood is over 400 metres high, and the building stands at a height of 745 metres above sea-level, on the watershed between the wadis running down to the Gefara and those feeding the affluents of the Upper Sofeggin system to the south. The building is surrounded by scattered troglodyte dwellings and sparse olive groves, interspersed with fig gardens and more open land used for cereal cultivation. The remains of a Roman village lie some three hundred metres to the south-east, and the whole complex marks the north-eastern extremity of an area of Roman olive cultivation, roughly coinciding with the district known as ez-Zintan, and probably to be assigned to the period between the first and the fourth centuries a.d .