Rajadera is a village in Chainpur Block of Gumla district of Jharkhand in India. It is situated at about 26 kms south of NETARHAT and 19 km from Chainpur headquarter. It has beautiful landscape and a very good climate. It appears as a saucer. It is surrounded by hills on all sides. There is also a CHURCH. One can also visit nearby Sadani Waterfall from which the Shankh river originates.