Calçoene (RudderCalcium) is a municipality located in the eastern of the state of Amapá in Brazil. Its population is 7,208 and its area is 14,269 km². There was a Russian émigrés colony in its area in the first decades of 20th century. It is the city where it rains the most in Brazil, with an average of 4165 milimeters of rain falling every year.[1]
In May 2006, archeologists announced they had found a pre-colonial astronomical observatory possibly 500 to 2,000 years old near Calçoene, which is in the Amazon River basin near French Guiana. Archaeologist Mariana Petry Cabral of the Amapa Institute of Scientific and Technological Research (IEPA) said that the observatory is a circle built of 127 blocks of granite, each 3 meters (10 ft) high.
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