Where is a place in Africa where I can ethically see lions?

With the recent events surrounding that nerdy American dentist shooting a prized Zimbabwean lion, I’ve been thinking lately about human relationships with animals.

I’ve wanted to visit Africa for a while and would very much like the chance to see lions and other wildlife in their natural habitat. I’m not looking for a “walking with lions” experience which I think is also problematic and potentially abusive, but rather a chance to see lions from a safe distance on a preserve without annoying them or having them know they’re being observed.

Has anyone done this before? Where is a place I can ethically observe big cats that preserves their lifestyle and habitats?