Saraswati River: The lost glory

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The Sarasvati River is one of the chief Rigvedic rivers mentioned in ancient Hindu texts. The Nadistuti hymn in the Rigveda (10.75) mentions the Sarasvati between the Yamuna in the east and the Sutlej in the west, and later Vedic texts like Tandya and Jaiminiya Brahmanas as well as the Mahabharata mention that the Sarasvati dried up in a desert. The goddess Sarasvati was originally a personification of this river, but later developed an independent identity and meaning.

The river Saraswati, during its heydays, is described to be much bigger than Sindhu or the Indus River. During the Vedic period, this river had coursed through the region between modern Yamuna and Sutlej. Though Saraswati is lost, many of its contemporary rivers like Markanda, Chautang and Ghaggar have outlived it and survived till today. All the big rivers of this period –Saraswati, Shatadru (Sutlej), Yamuna derived their waters from glaciers which had extensively covered the Himalayas during the Pleistocene times. The thawing of these glaciers during Holocene, the warm period that followed, generated many rivers, big and small, coursing down the Himalayan slopes. The enormity of waters available for agriculture and other occupations during those times had prompted the religiously bent ancient inhabitants to describe reverentially seven mighty rivers or Sapta Sindhu, as divine rivers arising from slowly moving serpent (Ahi), an apparent reference to the movement of glaciers.

According to geological and glaciological studies Saraswati was supposed to have originated in Bandapunch masiff (Sarawati-Rupin glacier confluence at Naitwar in western Garhwal). Descending through Adibadri, Bhavanipur and Balchapur in the foothills to the plains, the river took roughly a southwesterly course, passing through the plains of Punjab, Haryana,Rajasthan, Gujarat and finally it is believed to have debouched into the ancient Arabian Sea at the Great Rann of Kutch. In this long journey, Saraswati was believed to have had three tributaries, Shatadru (Sutlej) arising from Mount Kailas, Drishadvati from Siwalik Hills and the old Yamuna. Together, they flowed along a channel, presently identified as that of the Ghaggar river, also called Hakra River in Rajasthan and Nara in Sindh. The rivers, Saraswati and Ghaggar, are therefore supposed to be one and the same, though a few workers use the name Ghaggar to describe Saraswati’s upper course and Hakra to its lower course, while some others refer Saraswati of weak and declining stage, by the name Ghaggar1056.jpg (17594 bytes)Considerable philological debate has taken place about the roots of the nomenclature ‘Saraswati’, which is referred to by the name Harkhaiti or Haravaiti in regions further west of India. Apart from the nomenclature, the riverine systems of the period draining northwestern India had generated considerable discussion among the scholars about the positions (hierarchy) of the other feeder rivers, big and small, their sources and causes for their shifts which affected the supply of waters to the main rivers hastening their disintegration, e.g.Saraswati and its major tributary, Drishadvati.

Over a 3000 year-long period since the Vedic times the drainage pattern of many rivers had changed much from that described in the earlier religious literature. The decline of Saraswati appears to have commenced between 5000–3000 BC, probably precipitated by a major tectonic event in the Siwalik Hills of Sirmur region. Geologic studies indicate destabilizing tectonic events had occurred around the beginning of Pleistocene, about 1.7 my ago in the entire Siwalik domain, extending from Potwar in Pakistan to Assam in India, resulting in massive landslides and avalanches. These disturbances, which continued intermittently, were all linked to uplift of the Himalayas. Presumably, one of these events must have severed the glacier connection and cut off the supply of glacier melt-waters to this river. As a result, Saraswati became non-perennial and dependent on monsoon rains. All its majesty and splendour of the Vedic period dwindled and with the loss of its tributaries, major and minor, Saraswati’s march to oblivion commenced around 3000 BC. Bereft of waters through separation of its tributaries which shifted or got captured by other neighbouring river systems, Saraswati remained here and there as disconnected pools and lakes and ultimately became reduced to a dry channel bed. Lunkaransar, Didwana and Sambhar, the Ranns of Jaisalmer, Pachpadra etc, are a few of these notable lakes, some of them highly saline today, the only proof to their freshwater descent being occurrences of gastropod shells in these lake beds. With the decline and disappearance of Saraswati, the ancient civilizations, that it supported, also faded.

Intense investigations during the last thirty years have yielded fruitful data obtained through ground and satellite based techniques as well as from palaeoseismic, and palaeoclimatic records all of which had enabled a good reconstruction of the drainage evolution in northwestern India.Mainly, Indus and Saraswati, were the two major river systems of northwestern India during the Vedic period but the network of their tributaries, some of which are known to have deviated from their initial course or become non-existent today, have given scope for grouping these rivers into convenientclassifications.

Detailed evaluation 1058.gif (48543 bytes) obtained from remote sensing, geophysical, isotopic and other studies by various workers have been instrumental in sorting out many of the earlier speculative inferences and unsolved aspects of Saraswati river. Studies have traced the palaeochannel of this river through Punjab, Haryana and Rajasthan. They found that its course in these States is clearly highlighted in the LANDSAT imagery by the lush cover of vegetation thriving on the rich residual loamy soil along its earlier course. According to their findings, the river disappears abruptly in a depression in Pakistan, instead of in the sea, an observation shared by a few others also. But, digital enhancement studies of satellite IRS-1C data launched in 1995, combined with RADAR imagery (from European Remote Sensing satellite ERS-1/2) could identify subsurface features and thus recognize palaeochannels beneath the sands of Thar Desert. These channels are seen to extend upto Fort Abbas and Marot in Pakistan and appear in a line with present dry bed of Ghaggar (Figure 3). This river continues as Nara River in Sindh region and opens into the Rann of Kutch Another study of satellite derived data has revealed no palaeochannel link between Indus and Saraswati confirming that the two were independent rivers; also, the three palaeochannels, south of Ambala, seen to swerve westwards to join the ancient bed of Ghaggar, are inferred to be tributaries of Saraswati/ Ghaggar, and one among them, probably Drishadvati (Figure 4). The latter disappeared along with Saraswati due to shifts of its feeder streams from Siwalik and Aravalli ranges as well as due to the onset of desertification of Rajasthan . In this context, it is relevant to take note of the observation that Saraswati’s ancient course in this region is in continuity with another dry river bed–Hakra or Sotra which can be traced through Bikaner to Bhahawalpur and Sind in Pakistan, and finally upto the Rann of Kutch. Such a course appears likely if we backtrack the delta distributaries inland, when it is noticed they connect up with the existing palaeochannels there.