There is no border near Mt. Rainier. It is in the state of Washington.
the international date line
england
Thailland
Mali
Depending on which way you crossed it, you either get presents twice for going into yesterday, or none for going into tomorrow. I disagree. You should get presents for turning a new age, not for having a birthday.
the rocky mountains
the Hindu Kush Mountains
no navigable rivers crossed the mountains
The Blue Mountains of New South Wales were crossed by following the ridge tops, rather than the creeks, gullies or ravines.
Alps
Jedediah Smith crossed the Rocky Mountains in 1823. He crossed them while on his way to California and exploring the American West.
The three trails that crossed the Rocky Mountains at South Pass were called the Mormon, Oregon, and the California trails.
The army from Carthage crossed the Alps mountains.
To find the green mountains
Ural Mountains
No countries cross the International Date Line. The line was intentionally drawn that way to spare any country the nightmare of always having two different calendar dates within its borders.
Part of Antarctica is.