Twenty-six kilometres in length, the bay lies between the town of Riverton and the outflow of the Aparima River in the northwest, and the estuary of the Oreti River in the southeast.
It is situated on the south-eastern shorelines of the Jacobs River Estuary being formed by the Aparima and Pourakino Rivers, which leads through a narrow outflow channel into Foveaux Strait.
Thornbury is a small township on the east bank of the lower Aparima River, in western Southland, New Zealand.
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About 78% of the population breeds in the Southland Region on the southern end of South Island, New Zealand, especially beside the Mataura, the Oreti, the Aparima and Waiau Rivers.
After ending concurrency and crossing the Oreti and Aparima Rivers the highway continues proceeding in a north-westerly direction towards Wreys Bush and Nightcaps.