The Johanna River rises in the Otway Ranges in southwest Victoria, below Lavers Hill, and flows generally south through the Great Otway National Park before reaching its river mouth and emptying into the Great Australian Bight, west of Cape Otway at Johanna Beach, near Johanna.

From its highest point, the river descends 429 metres (1,407 ft) over its 14-kilometre (8.7 mi) course.

[5] The river, Johanna Beach and the surrounding locality of Johanna are named after the schooner Joanna, wrecked nearby on 22 September 1843.

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