God’s Big Acre (Texas nickname)

Some people insist that “God’s Big Acre” is another Texas nickname. If so, it’s very seldom used. Search engines show just a handful of hits.
 
The book God’s Big Acre: Life in 401 Country (1986) by George Elliott is about Ontario, Canada.
   
 
Texas Legends and Oddities
One Nick Name: What other state is called God’s Big Acre? Wonder Why?
(...)
The genuine “Native Texan” will know their way around all four and they will tell you that you’ll jus’ gotta kick the spinach salad and quiche habit by learning what’s cooking in God’s Big Acre.
 
28 April 1977, Austin (TX) American-Statesman, classified ads, col. 2:
GOD’S BIG ACRE
(20 MINUTES FROM AUSTIN)