BR-163 is a highway in Brazil, going from Cuiabá, the capital city of Mato Grosso state, to Santarém in the state of Pará. It runs through 1,732km in the heart of the Amazon Basin. Most parts of the road are muddy and impassable in the wet season. Lorries can get stuck for up to 10 days. As part of the Avança Brasil project, it has been proposed to pave the road in its entirety.
The unpaved sections of the road can be impassable when wet. In any case, driving 4WD is recommended due to uneven surface. BR 163 runs 1,732 kilometers from Cuiabá, Mato Grosso to Santarém, Pará, the second largest city on the Amazon river after Manaus, and most of it, about 900 kilometers, still unpaved.
Although it can be a reasonably easy drive in favourable conditions, this dusty and desolate road also has the potential to be a very difficult track and at times impassable after wet weather, specially from December to June. It is very important to check rainfall in this area before setting off and make sure you are well prepared for the trip.