Kartarpur corridor, the visa-free 4.7-kilometre long corridor, joins the Indian border to Gurdwara Darbar Sahib in Pakistan.
The visa-free crossing, allowing Indian Sikhs to visit the temple in Pakistan where Guru Nanak died in 1539, was first opened in 2019 for Nanak's 550th birth anniversary but was closed last year because of the pandemic.
The white-domed shrine in Kartarpur, a small town just four kilometres (2.5 miles) inside Pakistan, had remained out of reach of Indian Sikhs for decades because of hostile relations between the two countries.
When Pakistan was carved out of India at the end of British rule in 1947, Kartarpur ended up on the Pakistan side of the border, while most of the region's Sikhs remained on the other side.