The Sirjan basin extends south-east of the Esfahan basin and parallels the Yazd basin. It is named for the town of Sirjan at 29°28'N, 55°42'E which lies at the edge of the largest salt flat in the basin. It is somewhat higher than the Esfahan basin which is at 1300 m, being 1448-1710 m. It is distinguished from the Esfahan basin by its lack of a significant river. There are four major sumps in this basin, strung out along its length at regular intervals, and the northern two are connected as are the southern two. The sumps are fed by intermittent streams. Qanats and minor springs are found in this basin which has not been extensively explored. The sump in the north near Abarqu (31°08'N, 53°17'E) receives streams from the west (Kuh-e Bul at 3661 m and 30°48'N, 52°45'E) and from the east (Khar Kuh at 3512 m and 31°39'N, 53°46'E, and Shir Kuh at 4074 m and 31°37'N, 54°04'E). The southern basins near Sirjan receive their streams from lower elevations.

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