Knockagh Monument Stargazing Spot — Northern Ireland's largest war memorial on the escarpment above Belfast Lough — a free, easy-to-reach viewpoint with a car park and huge open views.
What you'll see: Big open views and a clear northern sky on good nights, with planets, the Moon, bright constellations and seasonal meteors. Town light to the south limits the darkest deep-sky views — nothing is guaranteed and it depends on cloud and moon.
Getting there: On Knockagh Hill above Greenisland, County Antrim, between Belfast and Carrickfergus. Follow signs up from the shore road to the monument car park.
When to go: Clear, moonless nights; look north away from the town glow. Darker and longer in winter.
Facilities: None beyond the car park. No toilets, no café, no lighting.
Cost: Free.
Good to know: Open and unlit at night. Bring a torch (a red light saves your night vision), warm layers and sturdy shoes, and tell someone where you are. Belfast light means the southern sky is bright — face north.
Plan your visit
Town light to the south, dark to the north
This is the honest catch with Knockagh. You are perched right above Belfast Lough, so Belfast, Carrickfergus and the shore towns light up the southern sky and the Milky Way will struggle to show that way. Turn your back on the towns and look north and inland over the hills, where the sky is far darker. It makes Knockagh a great spot for finding bright planets, the Moon, constellations and meteors, and for the view itself, rather than the deepest dark-sky night.
Northern Ireland's largest war memorialHigh escarpment viewpoint over Belfast LoughFree, with its own car park and a short walkDarker sky to the north, away from Belfast's glowSeasonal meteor showers overhead on clear nights
Good to know before you go:
No scheduled events here — it is a memorial and viewpoint you visit freely. Plan around clear, moonless nights and the August Perseid or December Geminid meteor showers.
Before you set off
What to bring
🔦A torch — ideally red-lightRed light lets you see the path without wrecking your night vision.
🧥More layers than you thinkYou’re standing still in the dark on a hill — it gets cold fast.
📱A star-map app & the forecastCheck the moon phase and cloud cover before you set off — a full moon washes the sky out.
🧣A flask & a blanketHalf the fun is sitting back with a hot drink while your eyes adjust.
Good to know
Everything before you go
Type
Free elevated viewpoint at a war memorial, above Belfast Lough
What you'll see
Big open views and a clear northern sky on good nights, with planets, the Moon, bright constellations and seasonal meteors. Town light to the south limits the darkest deep-sky views — nothing is guaranteed and it depends on cloud and moon.
Getting there
On Knockagh Hill above Greenisland, County Antrim, between Belfast and Carrickfergus. Follow signs up from the shore road to the monument car park.
Facilities
None beyond the car park. No toilets, no café, no lighting.
When to go
Clear, moonless nights; look north away from the town glow. Darker and longer in winter.
Cost
Free
Booking
No need
Good to know
Open and unlit at night. Bring a torch (a red light saves your night vision), warm layers and sturdy shoes, and tell someone where you are. Belfast light means the southern sky is bright — face north.
Parking
Free on-site car park, then a short marked walk to the obelisk.
Address
Knockagh Monument, Knockagh Hill, above Greenisland, County Antrim
Questions
Before you go
Is it free?
Free
When is the best time to go?
Clear, moonless nights; look north away from the town glow. Darker and longer in winter.
What will we actually see?
Big open views and a clear northern sky on good nights, with planets, the Moon, bright constellations and seasonal meteors. Town light to the south limits the darkest deep-sky views — nothing is guaranteed and it depends on cloud and moon.
Are there any facilities?
None beyond the car park. No toilets, no café, no lighting.
What should we bring?
Open and unlit at night. Bring a torch (a red light saves your night vision), warm layers and sturdy shoes, and tell someone where you are. Belfast light means the southern sky is bright — face north.
Getting there
Knockagh Monument Stargazing Spot is at Knockagh Monument, Knockagh Hill, above Greenisland, County Antrim. On Knockagh Hill above Greenisland, County Antrim, between Belfast and Carrickfergus. Follow signs up from the shore road to the monument car park. Tap below for directions.
The obelisk was raised after the First World War to remember the men of County Antrim who fell, with bronze panels added later for the dead of the Second World War. Modelled at half the scale of the Wellington Monument in Dublin, it stands 110 feet tall on the edge of the escarpment, a landmark you can pick out from far across Belfast Lough.
By night it becomes something else again. You park, you walk the short path, and the whole Lough opens up in lights below you. Keep the towns at your back, look north into the dark, and let a clear night bring out the planets and stars above one of the most storied viewpoints near Belfast.