The Shrine of Bayazid Bostami is a shrine in Chittagong, Bangladesh. Bayazid Bostami was a famous Persian Sufi born in Bostam, Iran. Its shrine area as a complex consists of a tomb surrounded by a brick structure along with an old mosque and a large pond. There is no significant historical evidence about Bostami's visit and tomb in this area. The whole complex is located on a hillock of Nasirabad, considered to be a holy place and attracts a large number of visitors and pilgrims daily.

Black Soft Shell turtles known as Bostami Turtle
In front of the tomb, there is a large pond that houses a large number of black soft-shelled turtles known as Bostami Turtle or Bostami Kachim (locally called Mazari) which are a very rare and critically endangered species. Legends claim that these turtles are the descendents of evil spirits that incurred the wrath of the renowned saint, Bayazid Bostami, while he was visiting the area. It is believed that the evil spirits were then transformed into turtles as a punishment and are doomed to spend eternity in this pool. At present, the shrine's caretakers – the Mazar Committee – protect the turtle population but will not allow specimens to be taken anymore, regardless of whether they would be killed or reintroduced into the wild.

Scientifically, the black soft-shelled turtle or Bostami Turtle (Aspideretes Nigricans, sometimes placed in genus Nilssonia) is a species of freshwater turtle found in India (Assam) and Bangladesh (Chittagong). They have been long-believed to be inbred variants of the Ganges soft-shelled turtle (A. gangeticus or N. gangeticus) or the Peacock Soft-shelled Turtle (A. hurum or N. hurum). While it is a close relative of the latter, it is a distinct species. As of 2002, the IUCN classified the species as Extinct in the Wild

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