Just outside the northern perimeter of Rohtas Fort, Gurdwara Chowa Sahib marks the site of a spring that tradition holds was created during Guru Nanak's travels through the Punjab in the early 16th century. According to the account, Nanak struck the ground with his staff and water welled up — chowa means spring in Punjabi — and the spot has been considered sacred ever since. The timing is striking: Nanak's journey and Sher Shah's construction of the fort were roughly contemporaneous, and the two sites sit only a few hundred metres apart.
The gurdwara was extensively renovated in the early 21st century and is one of the more active Sikh pilgrimage sites in Pakistan. Sikh visitors come from Lahore, from Nankana Sahib, and from abroad — particularly from India and the Sikh diaspora in Britain and Canada — especially around Sikh festivals and anniversary dates. Non-Sikh visitors are generally welcome to enter respectfully. The spring itself still flows within the gurdwara complex. If you are visiting Rohtas Fort, this is an easy addition — the two sites together give the area an unusual density of history.