The Editor

The Purus River, which rises in Peru, is a tributary of the Amazon River. The river flows through the Amazon Rainforest until it merges with the Solimões-Amazon River upstream from Manaus, Brazil. The river, which is highly meandering, has huge floodplains and is flanked by numerous lakes near its shores.

Serra del Divisor National Park is located in the Amazon rainforest of Peru, known as La Selva, along the border with Brazil. It borders the Serra do Divisor National Park in the Brazilian state of Acre, combining to make one of the largest contiguous blocks of protected areas in the Amazon.

Serra do Divisor National Park is located in the Amazon plain of western Brazil, near the border with Peru. Combined with Serra del Divisor National Park in Peru, it makes up one of the largest contiguous blocks of protected areas in the Amazon.

The Tunupa Volcano is located in the Potosí Department in southwestern Bolivia at the center of the Altiplano-Puna plateau. The now-dormant volcano is situated on a peninsula between Bolivia's most extensive salt flats, Salar de Uyuni and Salar de Coipasa.

The Juruá River is the most winding river in the Amazon Basin. Beginning in the highlands of east-central Peru and crossing into northwestern Brazil before it eventually empties into the Amazon River, it exhibits curvature and sluggishness as it traverses the low, half-flooded forest countryside.

The Nevado del Ruiz volcano is situated northwest of Colombia’s capital, Bogotá. Part of the Cordillera Central of the Colombian Andes, the volcano is one of several that lie within Los Nevados National Natural Park. Its 1985 eruption was the fourth deadliest in recorded history.

Valle Central is a highland valley region in central Costa Rica that hosts some of the most important cities in the country. Valle del General is an agricultural and coffee-growing region that lies at the base of the Cordillera de Talamanca in the south-central part of the country.

The Río Bravo or more formally the Río Bravo del Norte, in Mexico, is known as the Rio Grande in the United States. The river flows generally southward for approximately 1,900 mi, forming the border between Mexico and the U.S. state of Texas, before emptying into the Gulf of Mexico.

The Llanos de Moxos, or Beni Savanna, located in the Beni Department of northern Bolivia, contains extensive remains of pre-Columbian agricultural societies that were spread throughout the tropical savanna region. The remains testify to a well-organized and numerous indigenous people.

The Beni savanna is an ecoregion located in the Beni Department of northern Bolivia. Also known as the Llanos de Moxos, it is the third-largest savanna complex in South America and is found in the lowlands of the southwestern Amazon basin, extending northeast from the foot of the Andean ranges.