Cucui is a town in the Amazonas state of Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, on the border with the Amazonas

Amazonas (Venezuelan state)

Amazonas State is one of the 23 states into which Venezuela is divided.The state capital is Puerto Ayacucho. The capital until the early 1900s was San Fernando de Atabapo. Although named after the Amazon River, most of the state is drained by the Orinoco. Amazonas State covers a total surface...

 state of Venezuela

Venezuela

Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...

. The town is located slightly east of the Rio Negro, which flows through the Brazil–Colombia

Colombia

Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...

–Venezuela tripoint

Tripoint

A tripoint, or trijunction , is a geographical point at which the borders of three countries or subnational entities meet....

and forms the border between Colombia and Venezuela. The town serves as a checkpoint and crossing point for the Brazil–Venezuela and for the Brazil–Colombia borders.