The Tomb of Haj Mirza Mahmoud is located near the tomb of Aboumansour Riabi.
Haj Mirza Mahmoud was a prominent religious scholar and intellectual of the Qajar period in the Gonabad region, renowned for his piety, knowledge, and contributions to education. The site continues to serve as an active place of pilgrimage for local residents and visitors from surrounding areas, particularly on Thursday evenings and during religious occasions.
The Tomb of Haj Mirza Mahmoud reflects the deep connection between faith, knowledge, and culture in Riab.