At 2473metres,it is the highest mountain pass in Europe.

At 2473metres,it is the highest mountain pass in Europe.
这里的pass是什么词性,
怎么感觉 it is the highest mountain in Europe 就能说明它是欧洲最高的山了,为什么要加个pass?
另外，The great St.Bernard Pass connects Switzerland to Italy.
这里的Pass St.Bernard 中的St.这个是连接一起的名词吗。