Jalan Mersing is a major road in Johor. The road is part of Federal Route 50. It crosses from Kluang District to Mersing District. The road starts in downtown Kluang in its western end, where it connects with Jalan Hashim and Jalan Batu Pahat. On the eastern side, it ends at the T-junction with Federal Route 3, which is known as Jalan Jemaluang, as it is passing through the small town of Jemaluang.
Between Kluang and Jemaluang, Jalan Mersing passes through the small town of Kahang and Lenggor.