Topi (Pashto: ټوپۍ) is a town in the eastern part of the Swabi District of Khyber Pakhtunkhwa province of Pakistan.

[6] It is at located at a narrow spot in the Indus River valley, named after the town of Tarbela.

MA hydroelectric power plant on the right side of the main dam houses 14 generators fed with water from outlet tunnels 1, 2, and 3.

The catchment area upriver of the Tarbela Dam is spread over 168,000 square kilometres (65,000 sq mi) of land largely supplemented by snow and glacier melt from the southern slopes of the Himalayas.

[9] About 1,600 cubic meter per second of water is diverted from the Indus River near the town of Ghazi, Khyber Pakhtunkhwa, about 7 km downstream of Tarbela Dam (3,478 MW).

In the reach from Ghazi to Barotha, the Indus River inclines by 76 meters over a distance of 63 km.

The town of Topi is home of the Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI), named after Ghulam Ishaq Khan, a former President of Pakistan who had served at Topi during his illustrious career as a civil servant.