system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Where would be the best place to hide the One Ring?
gpt
Deep in the fires of Mt Doom.

The fact is there is no place where the Ring could be hidden that means it couldn't be found.

There is a mistaken belief that Sauron needed the Ring to take over the world, but its actually the other way around. Sauron was taking over the world so he could find the ring. He was going to win regardless, and all the rest could do was delay him.

With that said, the ring could not go to Valinor as Elrond said...
>And they who dwell beyond the Sea would not receive it: for good or ill it belongs to Middle-earth; it is for us who still dwell here to deal with it.

And throwing it into the sea has its own problem as seen in this exchange

>‘Then,’ said Glorfindel, ‘let us cast it into the deeps, and
so make the lies of Saruman come true. For it is clear now
that even at the Council his feet were already on a crooked
path. He knew that the Ring was not lost for ever, but wished
us to think so; for he began to lust for it for himself. Yet oft
in lies truth is hidden: in the Sea it would be safe.’
‘Not safe for ever,’ said Gandalf. ‘There are many things
in the deep waters; and seas and lands may change. And it is
not our part here to take thought only for a season, or for a
few lives of Men, or for a passing age of the world. We shouldseek a final end of this menace, even if we do not hope to make one.’

While it is true that the ring was hidden in the river for a long long time, and doing that again would probably be the easiest way to hide it for a long time, with Sauron poised to take over, it would no longer be feasible to hide the ring anywhere for any meaningful length of time any longer.