The Thul Hairo Khan is a Buddhist Stupa, built possibly between the 5th to 7th century CE near the modern-day town of Johi, in Sindh, Pakistan. It is constructed with baked and unbaked bricks fixed with a material made from mud mixed water. The stupa is 50 feet high and 30 feet wide in size. The stair from the north side of stupa leads to its top. The stupa has an arched tunnel at ground level which crosses from north to south. It is believed that stupas like Hairo Khan were built in Sindh between 5th to 7th centuries CE. Thul of Hairo Khan appears to be series of discovered in other regions of Sindh.
Buddhism in Pakistan took root some 2,300 years ago under the Mauryan king Ashoka who sent missionaries to the Kashmira-Gandhara region of North West Pakistan extending into Afghanistan, following the Third Buddhist council in Pataliputra (modern India).
Majjhantika, a monk from Varanasi was the first Buddhist to preach in Kashmir and Gandhara.
Buddhist sites in Sindh are numerous but ill preserved in various stages of deterioration.
Sites at Brahmanabad (Mansura Sanghar district) include a Buddhist stupa .