Ogosta in the context of Hydropower

The Danubian Plain (Bulgarian: Дунавска равнина, romanized: Dunavska ravnina) constitutes the northern part of Bulgaria, situated north of the Balkan Mountains and south of the Danube. Its western border is the Timok River, and to the east it borders the Black Sea. The plain has an area of 31,523 square kilometres (12,171 sq mi). It is about 500 kilometres (310 mi) long and 20 to 120 kilometres (12 to 75 mi) wide.

The Danubian Plain is contiguous with the Wallachian Plain (forming the Lower Danubian Plain), but its elevation is slightly higher and the relief is more hilly and rolling, featuring numerous plateaux and river valleys. The climate is markedly temperate continental with a weak Black Sea influence in the east. Precipitation is on average 450–650 mm a year. Important rivers include the Danube, the Iskar, the Yantra, the Osam, the Vit, the Rusenski Lom, the Ogosta, and the Lom.

Chiprovtsi (Bulgarian: Чипровци, pronounced [ˈtʃiproft͡si]) is a small town in northwestern Bulgaria, administratively part of Montana Province. It lies on the shores of the river Ogosta in the western Balkan Mountains, very close to the Bulgarian-Serbian border. A town of about 2,000 inhabitants, Chiprovtsi is the administrative centre of Chiprovtsi Municipality that also covers nine nearby villages.

Chiprovtsi is thought to have been founded in the Late Middle Ages as a mining and metalsmithing centre. Attracting German ore miners who introduced Roman Catholicism to the area, the town grew in importance as a cultural, economic, and religious centre of the Bulgarian Catholics and the entire Bulgarian northwest during the first few centuries of Ottoman rule. The apogee of this upsurge was the anti-Ottoman Chiprovtsi Uprising of 1688. After the suppression of the uprising, some of the town's population fled to Habsburg-ruled lands; those unable to flee were killed or enslaved by the Ottomans.

The Skat (Bulgarian: Скът, pronounced [ˈskɤt]; also transliterated Skǎt or Skut; Latin: Scitus) is a river in the western Danubian Plain of northern Bulgaria. With a length of 134 km, it is a right tributary of the Ogosta, itself a right tributary of the Danube.

Oryahovo (Bulgarian: Оряхово pronounced [oˈrʲaxovo]) is a port city in northwestern Bulgaria, part of Vratsa Province. It is located in a hilly area on the right bank of the Danube, just east of the mouth of the river Ogosta, a few more kilometres downstream from where the Jiu flows into the Danube on Romanian territory. The town is known for the ferry service that connects it to the Romanian town of Bechet across the river. There are also plans by local private companies for a bridge across the Danube.