Do you have to cross an ocean in order to reach Asia from Europe?

To cross between Asia and Europe, you would cross the Ural Mountains or the Caucasus mountains. If coming from another part of the world to Asia and Europe, then it would depend on where you were coming from and what your initial destination was. For example, if you were coming from Africa and first heading to Europe, then you would cross the Meditteranean Sea. If you were coming from South America and heading to Asia, you would cross the Pacific Ocean.