President Donald Trump announced the name of Alaska’s highest peak — and North America’s tallest at over 20,000 feet — Denali, would be changed back to Mount McKinley. Trump was sworn in as the 47th president on Monday,

The tallest peak in North America has been named Denali since 2015 when its name was officially changed under former President Barack Obama.

As part of a torrent of decisions he issued hours after taking office, President Donald Trump declared that the name of America’s tallest mountain be changed from Denali to Mount McKinley, and that the Gulf of Mexico be renamed “The Gulf of America.”