Sapiratum was a town, on an island of the Euphrates, identified by the Polish archaeologist Gawlikowski with the island of Bijan.
From 1979 to 1982, this site, located about 25 km downstream of Anah (ancient Anat), in a set of three consecutive islands, was excavated by the University of Warsaw as part of the rescue missions of Sites threatened by the construction of the Haditha dam.
The searches found nothing previous to the Assyrian median: a fortress built in two times, about 185 m long and 75 m wide.
The city of Sapiratum is mentioned in the archives of Mari, towards the first part of the 2nd millennium BC
So II120 clearly positions Sapiratum between Yabliya and Mari: “I went to Yabliyah in front of Atamrum ... I asked Atamrum: "Tell me where you want to go, that I can send some reliable information to My lord". Atamrum replied: "We will go to Sapiratum. At Sapiratum we shall consider whether I am going to Mari or whether I ought to cut through the steppe".”
It is probable that the oldest archaeological layers were destroyed by floods of the Euphrates.
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My notes of veracity :
The island of Bijan was called Sapiratum during the Bronze Age: 4/5