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Aerial view of the Kali Mas running through Surabaya. The Red Bridge is in the middle.

The Kali Mas ("Golden River" in Javanese), also known as Kali Surabaya,^[1] is a distributary of the Brantas River in East Java, flowing north-easterly towards the Madura Strait. This river also forms part of the border between the Sidoarjo and Gresik regencies of East Java, Indonesia.

^ "Asal Usul Kalimas yang Membelah Surabaya jadi Brang Kulon dan Brang Wetan". Radar Surabaya (in Indonesian). 16 May 2023. Retrieved 28 March 2024.