et al. (2017) confirm that the Great Rann of Kutch received sediments from a different source than the Indus, but this source stopped supplying sediments after ca. 10,000 years ago. Likewise, Dave et al. (2019) state that "[o]ur results disprove the proposed link between ancient settlements and large rivers from the Himalayas and indicate that the major palaeo-fluvial system traversing through this region ceased long before the establishment of the Harappan civilisation." According to Chaudhri et al. (2021) "the Saraswati River used to flow from the glaciated peaks of the Himalaya to the Arabian sea," and an "enormous amount of water was flowing through this channel network until BC 11,147." IVC and diminishing of the monsoons Many Indus Valley civilisation (Harrapan Civilisation) sites are found on the banks of and in the proximity of the Ghaggar-Hakra fluvial system, due to the "high monsoon rainfall" which fed the Ghaggar-Hakra in Mature Harappan Times. Giosan et al., in their study Fluvial landscapes of the Harappan civilisation, make clear that the Ghaggar-Hakra fluvial system was not a large glacier-fed Himalayan river, but a monsoonal-fed river. They concluded that the Indus Valley Civilisation prospered when the monsoons that fed the rivers diminished around 5,000 years ago. When the monsoons, which fed the rivers that supported the civilisation, further diminished and the rivers dried out as a result, the IVC declined some 4000 years ago. This in particular effected the Ghaggar-Hakra system, which became an intermittent river and was largely abandoned. Localized Late IVC-settlements are found eastwards, toward the more humid regions of the Indo-Gangetic Plain, where the decentralised late Harappan phase took place. The same widespread aridification in the third millennium BCE also led to water shortages and ecological changes in the Eurasian steppes, leading to a change of vegetation, triggering "higher mobility and transition to nomadic cattle breeding," These migrations eventually resulted in the Indo-Aryan migrations into South Asia. Identification with the Sarasvati A number of archaeologists and geologists have identified the Sarasvati river with the present-day Ghaggar-Hakra River, or the dried up part of it, despite the fact that it had already dried-up and become a small seasonal river before Vedic times. In the 19th and early 20th century a number of scholars, archaeologists and geologists have identified the Vedic Sarasvati River with the Ghaggar-Hakra River, such as Christian Lassen (1800-1876), Max Müller (1823-1900), Marc Aurel Stein (1862-1943), C.F. Oldham and Jane