Analysis of information sources in references of the Wikipedia article "கரக சதுர்த்தி" in Tamil language version.
... 'Karwa Chauth' is a ritual of fasting observed by married Hindu women seeking the longevity, ... married women in the northern and western parts of India, especially, Haryana, Jammu and Kashmir, Punjab, Rajasthan, Uttar Pradesh and Gujarat ... eat a little food before sunrise and start the fast ... After the moon rises ... finally break their fast ...
... karva chauth, a fast kept to secure the long life of husbands, was popular among Sikh women ...
... Karva Chauth, when a fast is universally observed by all married women, a small pot, karva, is required ...
... Karva Cauth seems to be in western Uttar Pradesh ...
... Sometimes even unmarried girls observe this fast and pray for their husbands-to-be ...