Brazil by area.

The municipality occupies most of the border between Amazonas and Rondônia, and is both the westernmost and northernmost city in the state.

History

Officially founded on October 2, 1914, Porto Velho was founded by pioneers around 1907, during the construction of the Madeira-Mamoré railroad. After the railroad was completed, the local population was about one thousand inhabitants; its buildings were chiefly the railway's

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