It originates in Oripää, and it flows through Pöytyä, Aura, Lieto, and ultimately the city of Turku before discharging into the Archipelago Sea.

The total length of the river is about 70 kilometres (43 mi), and it contains eleven rapids, the biggest of which is Nautelankoski at Lieto.

The reserve tap water for Turku Region is drawn from the Aura, the city's secondary waterworks being situated by the Halinen rapids.

[2] Situated in an agricultural zone, it is made turbid by surface runoff from nearby farms with eutrophication as the biggest threat.

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