It rises in the southern half of Dartmoor National Park in an area of bog to the west of Ryder's Hill.

After leaving the moor it passes through South Brent and then Avonwick and Aveton Gifford and flows into the sea at Bigbury-on-Sea.

[1] The estuary lies within the South Devon Area of Outstanding Natural Beauty and is part of the South Devon Heritage Coast.

[2] From 1893 until its closure in 1963, the Kingsbridge branch line railway line ran along the valley of the Avon between Kingsbridge and South Brent.

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