Belterra is a municipal seat and rubber plantation site some 40 km south of the Brazilian city of Santarém in the Northern federal state of Pará, a…Belterra is a municipal seat and rubber plantation site some 40 km south of the Brazilian city of Santarém in the Northern federal state of Pará, at the edge of the Planalto at 165 m above sea level. Amongst soil scientists, Belterra is famous for the underlying fertile, anthropogenic soil of 'Terra preta', which might have been amongst the criteria for the selection of this site for the plantation.