三合港（Chaah），是马来西亚柔佛州昔加末县的一个城镇，因有三条河而得名。三合港知名的菜肴有三合港油菜、砂煲田鸡、砂煲水鱼、三合港干捞面。

Chaah is the southernmost town in Segamat District, Johor, Malaysia. It is near the Batu Pahat - Segamat district and is 19 kilometres (12 mi) south from Labis via Federal Route 1.

Chaah consists of Kampung and Taman Chaah Town, C-Block, Kampung Baru (residents are mostly Chinese), Kampung Java (Malay Kampung), Taman Damai Jaya I & II, Taman Sri Chaah, Taman Orkid, and is surrounded by oil palm plantations. Taman Chaah Baru (new Chaah garden) is 1 to 2 kilometres (0.6 to 1.2 mi) from Chaah Town.