Buin Zahra (BoeinZahra) was a part of the township of Qazvin. It is located in the south of Qazvin province and bounded on the east by the province of Tehran, on the west by the township of Takestan and the province of Zanjan, being located to its west. This township is bounded by Markazi province in south.
The center of the township is the city of Bo'inn Zahra which is located on the road connecting Shahriar to Takestan. In 1963 an earthquake occurred which was one of the most disastrous earthquakes in the history of Iran, killing thousands of people. Buin Zahra (Bo'inn Zahra) is a suitable area for agricultural activities and small industries.