happy hunting ground

WordReference Random House Unabridged Dictionary of American English © 2025

hap′py hunt′ing ground′, 

1. the North American Indian heaven, conceived of as a paradise of hunting and feasting for warriors and hunters.
2. a place where one finds in abundance that which one needs or desires, or where one may pursue an activity without restriction:
   New England attics are happy hunting grounds for antique collectors.
• 1830–40, American.

Collins Concise English Dictionary © HarperCollins Publishers::

happy hunting ground noun

1. (in Native American legend) the paradise to which a person passes after death
2. a productive or profitable area for a person with a particular interest or requirement