It's certainly always hype to see even more secrets in BotW!
Breath of the Wild is certainly the game that keeps on giving. Even 5 years, 2 months, and 23 days after release we’re still discovering new things about it. There’s a special area in the out of bounds that actually has collision, letting you explore freely.
Be careful if you’re able to pull this off though because while you’re free to use things like horses or the Master Cycle, enemies still spawn here. It may be an incredibly distant place from the main behemoth that is Hyrule but that doesn’t mean it’s Calamity-free!