In archaeology, a ring ditch is a trench of circular or penannular plan, cut into bedrock. They are usually identified through aerial photography either as soil marks or cropmarks. When excavated, ring ditches are usually found to be the ploughed‐out remains of a round barrow where the barrow mound has completely disappeared, leaving only the infilled former quarry ditch. Both Neolithic and Bronze Age ring ditches have been discovered.
The Mamoré is a large river in Bolivia and Brazil which unites with the Beni to form the Madeira, one of the largest tributaries of the Amazon. It rises on the northern slope of the Sierra de Cochabamba, east of the city of Cochabamba, and is known as the Chimoré down to its junction with the Chapare. Its larger tributaries are the Chapare, Secure, Apere, and Yacuma from the west, and the Ichilo, Guapay, Ivari, Manique and Guapore from the east. Taking into account its length only, the Guapay should be considered the upper part of the Mamore; but it is shallow and obstructed, and carries a much smaller volume of water. The Guapore also rivals the Mamore in length and volume, having its source in the Parecis plateau, Mato Grosso, Brazil, a few miles from streams flowing north-ward to the Tapajos and Amazon, and southward to the Paraguay and Paraná rivers. The Mamore is interrupted by rapids a few miles above its junction with the Beni, but a railway 300 km long has been undertaken from below the rapids of the Madeira. Above the rapids the river is navigable to Chimore, at the foot of the sierra, and most of its tributaries are navigable for long distances. In 1874, Franz Keller gave the outflow of the Mamoré at mean water level, and not including the Guapore, as 41,459 cm3/sec, and the area of its drainage basin, also not including the Guapore, as 24,299 km2.
José Ballivián is a province of the Beni Department in northern Bolivia. It is named for José Ballivián, a general and former president of Bolivia who lived from 1805 until 1852. The province has a north-south extent. To the west the province is bounded by the Beni River, to the east it borders on the Yacuma Province of the Beni Department.
Rápulo River also Ráputo River is a river in Beni Department, Bolivia. It is a tributary of the Yacuma River in the Amazon Basin. It joins the Yacuma just below the town of Santa Ana del Yacuma.
Rogagua Lake is a lake in the pampas area in the northern Bolivia, in the José Ballivián Province of the Beni Department.
Rogaguado Lake is a tropical fresh water in the northern Bolivia, in the Yacuma Province of the Beni Department. It is close to the Rogagua Lake. The lake is 25,40 km long and 18,53 km wide, and it has an area of 315 km², making it one of the biggest lakes in Bolivia. It contains six islands, the biggest ones of 1 km² and the smaller ones of 0,65 km², located at the north side of the lake.
Exaltación is a town in Yacuma Province in the Beni Department of northern Bolivia.
Santa Ana del Yacuma is a town in the Beni Department in north-eastern Bolivia.
Santa Rosa de Yacuma or Santa Rosa del Yacuma is a small town in the Amazon pampas of the Bolivian Beni Department.
Santa Ana del Yacuma Airport is an airport serving the town of Santa Ana del Yacuma in the Beni Department of Bolivia. The runway is just south of the town.
Beni Biological Station Biosphere Reserve ) is a protected area in Bolivia located in the Beni Department, in the José Ballivián Province and Yacuma Province.
Huaytunas Lake is a lake in the Yacuma Province, Beni Department, Bolivia. At an elevation of 146 m, its surface area is 329.5 km².
GuachunaLake is a lake in the Yacuma Province, Beni Department, Bolivia. At an elevation of 150 m, its surface area is 102.8 km².
Laguna La Porfía is a lake in the Yacuma Province, Beni Department, Bolivia. Its surface area is 58.5 km².
Laguna Bravo is a lake in the Yacuma Province, Beni Department, Bolivia. At an elevation of 167 m, its surface area is 25.7 km².
Santa Ana Municipality or Santa Ana del Yacuma Municipality is a municipality of the Beni Department, Bolivia.
Santa Rosa or Santa Rosa de(l) Yacuma is a municipality of the José Ballivián Province in the Beni Department of Bolivia. The seat of the municipality is the town of Santa Rosa de Yacuma.
El Triunfo Airport is an airstrip by the Yacuma River in the pampa of the Beni Department in Bolivia. The nearest town is Santa Ana del Yacuma, 42 kilometres (26 mi) to the east.
Villa Negrita Airport is a public use airstrip near Villa Negrita in the Beni Department of Bolivia. Villa Negrita is a ranching region of Yacuma Province, south of Lake Guachuna in the Bolivian pampa.
Bolivia 
