English: Nilsagar a historical dighi (big pond) which stands at Dhobadanga mauza of Gorgram union about 14 km southwest of Nilphamari district headquarters. During the reign of Raja Birat, there were many cow farms at Gorgram. Raja Birat dug a large dighi named Birat Dighi or Birna Dighi or Binna Dighi for the cows. After the independence of Bangladesh, the dighi was renamed as Nilsagar
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