A South Australian sculptor has beaten artists from around the world in claiming the top prize at the Palmer Sculpture Biennial.

Astra Parker's work A Plane at Drift - a 25-by-12-metre cloth and steel installation somewhat suggestive of a clothes line rippling in the wind - picked up the Artists' Prize.

Votes were cast by the 24 artists who exhibited works in the rugged hills above Palmer where the biennial was staged in March.

Second prize was split between Deb Sleeman, for Refuge Seekers, and local property owner Greg Johns, for The Round Space.

Third went to Chris Ormerod's Dalnotter and Carlotta Brunetti's Drops.

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The ninth biennial continued to grow the event's national and international reputation, despite having to close early due to the COVID-19 pandemic.

Four artists brought work from interstate for the occasion, and two travelled from overseas.

• More information: palmersculpturebiennial.org.

Photos: Astra Parker, Michael Kluvanek.