What is the highest of Earth's physical features?
That would be Mount Everest in Nepal, Asia. Click on the link below and read for further information.http://en.wikipedia.org/wiki/Mount_Everest
Mt. Everest but technically it's Mauna Kea Hawaii
The highest point on Earth is the peak of Mt. Everest at 8,848 m (29,029 ft) above sea level. Is that what you meant?
Mount Everest of course,but the atmosphere is also a physical feature,I believe!?, is it not