Crossing the Border
A Brazilian-built bridge – with a cool lane-crossing system that switches from Guyana's left-hand driving to Brazil's right-hand driving – straddles the Takutu River from Lethem on Guyana's side to Bonfim, Brazil, on the other. Stamp out of customs and immigration at the bridge on the Guyana side and stamp into the corresponding office at the Brazil end. There are no fees at the border and the immigration office hours are 7am to 7pm daily.
Note that American, Canadian and Australian nationals need visas. These are available in Georgetown – the Brazilian consulate in Lethem does not issue them – and you should count on a week for processing.