The Sultan Ismail Jamek Mosque is the largest mosque in Batu Pahat and the principal Friday prayer hall for the town. Its multi-tiered tiled roof and slender minarets follow the regional Johor style, drawing on Sumatran Minangkabau cues. The building you see now dates from a 1990s expansion, but the foundation goes back to the original wooden village mosque established in the 1920s.
Non-Muslim visitors are welcome outside prayer times provided they dress modestly — robes are loaned at the entrance. The grounds are particularly lively at iftar during Ramadan, when stalls line the perimeter selling food for breaking the fast. A second, older mosque — Masjid Jamek Ampuan — sits closer to the town centre and is worth a brief look for its colonial-era timber detailing.