Oklahoma doesn't have Indian Reservations. The State does however, have 39 federally-recognized tribal nations headquarters in the state, and rank second to California as the state with the largest Native American population.
Oklahoma's state capitol building is the only capitol in the world with an oil well under it. Although its legal description is Capitol Site #1, it is referred to as Petunia #1 because it was originally drilled in the middle of a flower bed.