I would suggest dropping a hellevator right through the big dark regions on the right of the image, detouring around hives (or not) as needed. If it's not in the higher dark regions there, it's probably down in the lava caverns.
The thing is, it's definitely somewhere. You've got big unexplored areas there which are definitely big enough for the Temple to hide in. And it often does end up on the edge of the biome just by size.
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