Pope Francis will preside over an interfaith meeting in a mosque in the world's largest predominantly Muslim country during a four-nation Asian visit in September that will be the longest and most complicated foreign trip of his pontificate.

The Vatican on Friday released the itinerary for Francis' Sept. 2-13 trip to Indonesia, East Timor, Papua New Guinea and Singapore. The packed schedule makes clear that the 87-year-old pontiff, who has battled health problems and is increasingly reliant on a wheelchair, has no plans to slow down.