The Quarteira River (Portuguese pronunciation: [kwɐɾˈtɐjɾɐ]) is a small river in the Portuguese region of the Algarve.

[2] The Quarteira is one of a number of small rivers in the central Algarve which make up the water ecosystem known as the Querença – Silves Aquifer System.

[3] A short distance from the confluence of the Quarteira the river passes the village of Paderne and then snakes in a large loop around a hill which is topped by the remains of the Moorish Castle of Paderne.

Next to this watermill stands a Bridge built by the Romans.

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