Divis and the Black Mountain form the rough upland wall behind Belfast, close enough to the city to reach easily but high enough to feel like a proper change of weather and scale. The National Trust manages trails across heath, grassland, and bog, with views over Belfast Lough, the city grid, Lough Neagh, and, on a clear day, Scotland.
The summit trail is the straightforward choice if time is short, though the wider network rewards a longer wander. Conditions can shift quickly up here, so bring a layer even when Belfast below feels mild. For photographers, late afternoon is hard to beat, with the city lit below and the hills turning dark behind you.