Chhath is an ancient Hindu Vedic festival celebrated in Bihar, Jharkhand, Uttar Pradesh and Madhesh region of Nepal.
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The Chhath Puja is dedicated to the solar deity Surya and Shashthi devi in order to thank them for their life.
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It is believed that the main sources of Sun's powers are his wife Usha and Pratyusha.
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The first rays of the Sun and its last rays are worshiped
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The rituals are rigorous and are observed over a period of four days.
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The rituals are rigourous and includes fasting, abstaining from drinking water and standing in water for long hours
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Some devotees also perform a prostration march as they head for the river banks.
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Environmentalists have claimed that the festival of Chhath is one of the most eco-friendly religious festivals that should be used to spread the "the message of nature conservation".