Definition of "Beulah"

Thou shalt no more be termed Forsaken; neither shall thy land any more be termed Desolate: but thou shalt be called Hephzibah, and thy land Beulah: for the LORD delighteth in thee, and thy land shall be married.

1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Isaiah 62:4

I was into names then for some reason, and hit upon the name Beulah. When I was a child it was a name like Bertha, and you made a joke about Beulah, Big Beulah. I thought, wouldn't it be nice to use the name Beulah and try to get it in a poem.

2003, Rita Dove, Earl G. Ingersoll, Conversations with Rita Dove, Univ. of Mississippi, page 43