The Neblina massif is a sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

 mountain located in the Northern Amazon Basin

Amazon Basin

The Amazon Basin is the part of South America drained by the Amazon River and its tributaries that drains an area of about , or roughly 40 percent of South America. The basin is located in the countries of Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela...

. The massif is a tilted, heavily eroded plateau

Dissected plateau

A dissected plateau is a plateau area that has been severely eroded so that the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from orogenic mountain belts by the lack of folding, metamorphism, extensive faulting, or magmatic activity...

, with a deep canyon in its central portion (Cañón Grande), drained by the Baria River. The south-eastern ridge of the massif

Massif

In geology, a massif is a section of a planet's crust that is demarcated by faults or flexures. In the movement of the crust, a massif tends to retain its internal structure while being displaced as a whole...

 forms part of the 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...

-Brasil border, and it is where the massif reaches its highest elevation, the Pico da Neblina

Pico da Neblina

Pico da Neblina is the highest mountain in Brazil, above sea level, in the Serra do Imeri, a section of the Guiana Highlands on the Brazil–Venezuela border. As determined by a border survey expedition in 1962, its summit lies just within Brazilian territory, at a horizontal distance of only from...

in Brazilian territory.

The massif was first explored in 1954 by an American expedition that performed aerial inspection and then climbed the massif's north-western slopes.