Rajesh Kocchar further notes that, even if the Sutlej and the Yamuna had drained into the Ghaggar during Vedic period, it still would not fit the Rig Vedic descriptions because "the snow-fed Satluj and Yamuna would strengthen the lower Ghaggar. upper Ghaggar would still be as puny as it is today." According to Rajesh Koccha there are two Sarasvati rivers mentioned in the Rigveda. The older one described in the family books of the Rigveda, which he calls "Naditama Sarasvati", drains into a samudra. The newer one described in the tenth book of Rigveda as well as later Vedic texts, which he calls "Vinasana Sarasvati", disappears in the sands. The "Vinasana Sarasvati" has been "accepted by all" to be the same as the Ghaggar-Hakra river. The description of the "Naditama Sarasvati" in the Rigveda matches the physical features of the Helmand River in Afghanistan, more precisely its tributary the Harut River, whose older name was "Haraxvatī" in Avestan. Ganga and Yamuna, he takes to be small streams in its vicinity. When the Vedic people moved east into Punjab, they named the new rivers they encountered after the old rivers they knew from Helmand.