WP, in an ideal world.....
The required obstacle clearance limits and spaces are defined, as is the runway end safety area.
Mostly, when all is well, they are adequate.
You can't design an aerodrome that will guarantee a safe arrival for every eventuality, sadly. There will always be a case where a little more flat land a little further from the airport would have made a difference.
(Case in point, Smolensk, where the Polish president's a/c crashed. Plenty others.)