'Beulah Land' comes from "Pilgrim's Progress," by Bunyan, 1628-1688. Bunyan used the name for an idyllic land near the end of life's journey. It later appeared in sermons and hymns.

The most popular hymn now is "Beulah Land," words by Edgar P. Stites, music by John R. Sweney, 1876, posted in thread 37937: Beulah Land
There are several others.

Pioneers moving west spoke of their destination (hopefully) as Beulah Land.