Board Thread:Fun and Games/@comment-31833197-20180731082808/@comment-29646689-20180811145305

Conclusion:

The entire planet has massive reserves of Elixir and Gold (and some Dark Elixir) underneath, to the point where you can dig down anywhere and you can find them.

Conclusion 2:

There's a subterranean planet-wide Elixir ocean in CoC.