São Sebastião do Uatumã  São Sebastião do Uatumã is a municipality located in the Brazilian state of Amazonas. Its population was 8,748 (2005) and its area is 10,741 km². The municipality contains part of the Uatumã Biological Reserve, a strictly protected conservation unit created in 2002. It contains about 60% of the Uatumã Sustainable Development Reserve, which protects the lower part of the Uatumã River basin.