Oklo in Gabon, Africa. See https://www.iaea.org/newscenter/news/meet-oklo-the-earths-two-billion-year-old-only-known-natural-nuclear-reactor https://www.iaea.o

Oklo in Gabon, Africa. See https://www.iaea.org/newscenter/news/meet-oklo-the-earths-two-billion-year-old-only-known-natural-nuclear-reactor https://www.iaea.org/newscenter/news/meet-oklo-the-earths-tw...