The Muar River is a river which flows through the states of Negeri Sembilan and Johor in Malaysia. Its drainage basin encompasses the states aforementioned, as well as Pahang and Malacca. Measuring around 250 km in length, the Muar is the third longest river in Peninsular Malaysia after the rivers of Pahang and Perak, slightly longer than the Kelanta…The Muar River is a river which flows through the states of Negeri Sembilan and Johor in Malaysia. Its drainage basin encompasses the states aforementioned, as well as Pahang and Malacca. Measuring around 250 km in length, the Muar is the third longest river in Peninsular Malaysia after the rivers of Pahang and Perak, slightly longer than the Kelantan River. It is one of the two major Negri rivers, the other being the Linggi, as well as the second most significantly important river in Johor after the Johor River.