First, the name! Sahastra is the sanskrit word for 1,000. Linga is the aniconic representation of the Lord Shiva. Apparently, at one time, there were many small temples dedicated to Shiva in the area. These were razed to facilitate construction of a rauza (mausoleum) - when, and to whom, and exactly where I have been unable to discover.
Second, the complex is a large water reservoir extending over 17 heactares, attributed to the Solanki Siddh-Raj Jay-Singh who ruled 1094 - 1143 AD. It is located less than 500 metres northwest of the Rani ni Vav.
Third, in overall conception, water is (was) taken from the Saraswati River (now dry) to the north along a channel to the south and stored in a cistern, known as the Rudra Kupa, 40 metres in diameter. The distance travelled about 400 metres. Water was then extracted from the cistern and directed easterly along an inlet channel for about 200 metres before hanging a right south. This is all best viewed in Google Earth at an eye altitude of 750 metres. The water channels featured sloping embankments reinforced with brick and stone.
This photo is of the western end of the southern section of the complex.
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