<P> Brahma Sarovar is an ancient water tank sacred to Hinduism in Thanesar, in the state of Haryana in North India . Hinduism lays emphasis on taking bath for internal and external purity . Most religious sites have water tanks or sarovar in or near the temple / gurdwara . The Hindu genealogy registers at Kurukshetra, Haryana are kept here . </P> <P> According to stories of myths, Lord Brahma created the universe from the land of Kurukshetra after a huge yajna . The Brahma Sarovar here is believed to be the cradle of civilization . The sarovar is also mentioned in the eleventh century AD memoirs of Al Beruni, called' Kitab - ul - Hind' . The sarovar also has a mention in Mahabharata citing its use by Duryodhana to hide himself under water on the concluding day of the war . </P> <P> A sacred shrine dedicated to Lord Shiva stands within the sarovar, accessible by a small bridge . According to scriptures, bathing in this sarovar increases the sanctity of performing the' ashvamedh yajna' . The tank offers a breath - taking sight during the Gita Jayanti celebrations held in the last week of November and early December every year when there will be' deep daan' and' aarti' . This also happens to be the time when migratory birds from distant places wing it to the sarovar . The Birla Gita Mandir and Baba Nath's haveli and temple are the neighbouring attractions . </P> <P> The historic Brahma Sarovar has been renovated with modern facilities and pathways . It is 3600 feet long and 1500 feet broad and is in the shape of perfect rectangular . The tanks are especially crowded during solar eclipse because it is believed that a dip there during the solar eclipse absolves one of all sins . It is considered as one of the largest man - made ponds . </P>

Which is the biggest holy lake surrounded by concrete bank on four sides in haryana