Mullaghanish

Overview

Mullaghanish (Irish: Mullach an Ois) is a 649 m (2,129 ft) high mountain in the Derrynasaggart range, situated just north‑east of the village of Ballyvourney in County Cork, Ireland. With a prominence of 259 m it ranks 11th among the 262 summits in Cork and is a recognised Marilyn and Hewitt. The peak offers sweeping views across the southwest of Ireland – you can spot the rolling hills of Kerry, the coastline of Limerick and the rugged interior of Cork on a clear day. Its GPS coordinates are 51.982539 N, 9.144164 W, and the mountain is easily located on the Ordnance Survey map sheet 79 (grid reference W23561 82416).

Name and Meaning

The Irish name Mullach an Ois translates as “summit of the deer”. The word ois refers to a deer or fawn, and the name reflects the mountain’s historic association with the wildlife of the Derrynasaggart hills.

Geology and Landscape

Mullaghanish sits on a bedrock of green‑grey sandstone and purple siltstone belonging to the Gun Point Formation. The terrain is typical of western Irish uplands – a mix of heather‑covered bog, peat soils and occasional rocky outcrops. The summit plateau is relatively flat, making it an ideal spot for the 225 m TV mast and for taking in the 360° panorama.

History

The mountain is perhaps best known for the Mullaghanish transmission site, one of the original five main television transmitters launched by Telefís Éireann. The first low‑power service went live in December 1962 and, by September 1963, a full 625‑line VHF service was broadcasting to the southwest of Ireland – covering counties Cork, Kerry and Limerick. The original mast stood 170 m tall. In 2009, in preparation for digital terrestrial television (DTT), a new 225 m mast was erected, making it the tallest television transmitter in the country. The old structure was subsequently dismantled.

Analogue television ceased on 24 October 2012, and the site now carries the national Saorview DTT service at an effective radiated power of 200 kW – the most powerful TV transmitter in Ireland today. The site is owned and operated by 2RN, a subsidiary of RTÉ. In addition to digital TV, six national FM radio services are transmitted from Mullaghanish, each using vertical polarisation. The transmitter also boasts the highest number of relays (20) of any Irish TV transmitter, reflecting the challenging topography of its coverage area.

What to See & Do

Hiking to the Summit

A well‑marked trail leads from a small car park on the Ballyvourney side up to the summit. The walk is roughly 7 km round‑trip, gaining about 545 m in elevation and taking around two hours each way for a fit walker. The route traverses typical western Irish upland terrain – heather, peat bogs and occasional rocky outcrops – before opening onto a broad, windswept summit plateau. From the top you can spot the imposing 225 m mast, its latticework silhouetted against the sky, and enjoy 360° panoramas that include the MacGillycuddy’s Reeks to the south and the River Lee valley to the north.

Broadcasting Heritage

At the summit you will find a small information board detailing the transmitter’s history and technical specifications. Radio enthusiasts can tune the six FM services listed below and experience the clear, vertical‑polarised signal that reaches deep into the surrounding counties. The site also offers a unique perspective on the evolution of Irish broadcasting – from the early VHF days to today’s high‑power Saorview service.

Photographic Opportunities

The early morning light (around 06:46 – 08:16) and the golden hour at sunset (19:06 – 20:36) provide ideal conditions for landscape photography. The mast itself makes a striking subject, especially when backlit by the low sun. The surrounding Derrynasaggart hills – Caherbarnagh, Moylussa and Tountinna – are visible and can be identified using the PeakVisor 3‑D maps linked below.

Cycling Routes

Mullaghanish is a popular climb for cyclists. Two main ascent routes are documented on Climbfinder:

• Ballyvourney side – the most frequently used route, following the same access road that walkers use. It is a steady climb of about 3.5 km with sections reaching a 14 % gradient. The road is paved and private; cyclists should respect any signage.
• Glantane side – a longer, gentler option of 8.4 km with an average gradient of 2.4 % and a maximum of 6.8 % on the steepest segment. The total elevation gain is 206 m, reaching a subsidiary summit at 408 m before the final approach to the main mast.

Both routes are suitable for road bikes with a compact gearing set‑up (e.g., 34‑front chainring, 28‑30 rear sprocket). No special equipment is required, but a good level of fitness will make the climb more enjoyable.

Driving the Private Road

A paved private road leads right up to the transmitter complex. According to DangerousRoads.org the road is 3.5 km long, climbs 362 m and includes sections of up to a 14 % gradient. Height clearance is limited to 3.5 m, and the road is private – access is generally permitted for walkers, cyclists and authorised vehicles, but drivers should obey any posted restrictions and be prepared for occasional traffic from maintenance crews.

Practical Information

Mullaghanish is open year‑round and there is no admission charge. The trailhead parking area is free and located just off the R585 road near Ballyvourney. The car park provides roughly ten spaces; during peak times it can fill quickly, so early arrival is advisable.

The transmitter site is owned by 2RN; while the mast and technical buildings are not open to the public, the summit area is freely accessible. Visitors should follow the marked path and respect any signage indicating restricted zones around the antennae.

The mountain can be reached by car from Cork city (approximately 80 km) via the N22 and R585, or from Killarney (about 70 km) via the N71 and local roads. Public transport options are limited, so a private vehicle is recommended.

Weather & Gear

Conditions on the summit can change rapidly. Even in summer, wind and rain are common, so bring waterproof clothing, sturdy walking shoes and enough water and snacks for a half‑day outing. In winter the ground can be very boggy; crampons are not required but good ankle‑supporting boots are advisable.

Nearby Peaks & Day‑Trip Ideas

From Mullaghanish you have clear sightlines to several other Derrynasaggart summits, such as Caherbarnagh (681 m) and the Paps of Anu (747 m). Combining a walk to Mullaghanish with a short detour to the Paps makes for a rewarding full‑day hill‑walking circuit.

Transmission Details

Digital Television (Saorview)

FM Radio Services

For further details on routes and 3‑D maps, see the PeakVisor pages:

• Hiking Map
• Panorama 3D

Mullaghanish offers a rare blend of natural beauty and technological history, making it a rewarding destination for walkers, cyclists, radio fans and anyone interested in Ireland’s broadcasting heritage.