You can also weigh it down and sink it to the bottom of oceans that don't have wood eating organisms. The Baltic and the Black Sea are the ones I know. But of

You can also weigh it down and sink it to the bottom of oceans that don't have wood eating organisms. The Baltic and the Black Sea are the ones I know. But of course, the solution you mention is the simplest: Treat the wood with one of the several known ways to make it not break down, and leave it in big piles somewhere.