Massanjore dam situated across the Mayurakshi River in Dumka district of Jharkhand. The dam is about 155 feet high from its base and 2170 feet long. The reservoir has an area of 16, 650 acres when full and has a storage capacity of 500,000 acre feet.The dam was built with Candian aid, it is also called Canada Dam or Pearson Dam. It was commissioned in 1955. . It was formally inaugurated by Lester B. Pearson, Foreign Minister of Canada.
From the counterpart rupee fund created through supplies of wheat and other materials from Canada for use in India, Canada devoted those rupees to the further development of the Mayurakshi dam project.
It is about 25 kms from Dumka district and 45 kms from West Bengal. It is situated on Suri-Dumka road and accessible from Dumka via roadways.