The 27-year-old from Edinburgh took a break from the saddle in his latest epic ride to climb Mount Aconcagua in the Andes, South America's highest peak.
He said he felt "utterly exhausted and exhilarated" when he reached the summit.
He was joined on the climb by a guide and two other climbers.
Mr Beaumont is on a 12,500-mile journey through North and South America. He began the adventure last May by climbing Mount McKinley in Alaska, the highest peak in North America.
He hopes to complete the trip in the next three or four weeks. He is filming his journey for the BBC.