What's the definition of wilderness used on this map? The only wilderness area on the map that I've been to is the Okavango delta (which is amazing btw), but in

What's the definition of wilderness used on this map? The only wilderness area on the map that I've been to is the Okavango delta (which is amazing btw), but in terms of remoteness (lack of people/infrastructure) it's not that different from many of the surrounding areas