Mount Ebott

Mount Ebott (which, uncoincidentally, "Ebott" spelled backwards was "ttobe", a derivation of "Toby"), often abbreviated as Mt. Ebott, was a mountain on the Surface of the Earth. It was the mountain that monsters were banished under, making it the only known point of entry into the Underground; due to this, legends said that those who climbed it never returned. However, eight humans still fell through the barrier on Mount Ebott into the Underground, one of them being Chara, who fell in the year 201X. It is unknown what years any of the other humans fell.

While it was never directly stated where Mount Ebott was, Chara's statement about Vegetoid "Not monitored by the USDA" made the location likely to be somewhere in the United States.