Mount Usborne, Summit in East Falkland, Falkland Islands

Mount Usborne, called Cerro Alberdi in Spanish, is the highest point in the Falkland Islands at 705 m (2,312 ft), 5 m taller than Mount Adam on West Falkland. It lies on East Falkland in the Alturas Rivadavia range, about 53 km west of Stanley. Remains of glacial cirques are visible on its slopes, and Black Tarn sits on its north-eastern slope. Stone runs cross the slopes, made of finer, closer-spaced, jumbled rocks than those at lower elevations.

The peak takes its name from Alexander Burns Usborne, who served aboard HMS Beagle during Charles Darwin's voyage in the 1830s. British expeditions of that era were mapping the South Atlantic and naming its landmarks as they went.

The Spanish name Cerro Alberdi honours Juan Bautista Alberdi, the Argentine jurist and writer who shaped the Constitution of 1853; the English name remembers Alexander Burns Usborne, master's assistant on HMS Beagle. Both names sit on the same 705 m peak, and the Argentine one predates British occupation of the islands.

Access requires advance permission from the landowners, as the land is privately held. The approach involves rough dirt tracks and open terrain, so sturdy footwear and weatherproof clothing are necessary given how quickly conditions can change.

The stone runs on the slopes were not formed by erosion but by frost action, where ice slowly broke apart and shifted the rock over thousands of years. These formations are found across the Falkland Islands and this summit is one of the better places to see them up close.