On which planet did the American astronaut Mark Watney get stranded in the film directed by Ridley Scott?

"The Martian" is a 2015 science fiction film directed by Ridley Scott and starring Matt Damon. Drew Goddard adapted the screenplay from "The Martian", a 2011 novel by Andy Weir. The film depicts an astronaut's (Damon) lone struggle to survive on Mars after being left behind, and the efforts of NASA (National Aeronautics and Space Administration) to rescue him and bring him home to Earth.

In the film, he crew of the Ares III mission to Mars is exploring Acidalia Planitia on Martian solar day (sol) 18 of their 31-sol expedition. A severe dust storm threatens to topple their Mars Ascent Vehicle (MAV). The mission is scrubbed, but as the crew evacuates, astronaut Mark Watney is struck by debris. The telemetry from his suit's bio-monitor is damaged and Watney is presumed dead. With the MAV on the verge of toppling, the remaining crew takes off for their orbiting vessel, the "Hermes".

Watney awakens after the storm, injured and with a high-oxygen warning. He returns to the crew's surface habitat ("Hab") and treats his wound. As Watney recovers, he begins a video diary. Unable to communicate with Earth, his only chance of rescue is the next Mars mission.