The sand is not natural
The near-white sand at Ballydonegan is not natural. It is crushed quartz, washed down to the shore over decades from the copper mines above Allihies, and it is the reason this beach looks different from any other on the Beara Peninsula. The ore-dressing works ground huge quantities of quartz, and rainwater carried the fine spoil down the slopes to the sea, where it settled as the bright, powder-like sand you walk on today. The mining ruins are still scattered across the hills behind the bay, and the Allihies Copper Mines Museum, in a former Cornish-built chapel in the village, tells the rest of the story.
Copper was worked in these hills as far back as the Bronze Age, and the 19th-century mines kept going well into the 20th century. So the beach you come to relax on is, in effect, industrial waste from a working that ran for the best part of two hundred years. It is also one of the most south-westerly strands in Ireland: a wide sweep of pale sand backed by low cliffs, fields and the Slieve Miskish mountains, far out on a peninsula that already feels like the edge of things.
What it is good for
Ballydonegan is a beach for walking, looking and fishing rather than for a busy seaside day. The bay is a known spot for sea angling, with bass, coalfish, cod, dogfish, flounder, pollock and turbot all taken from the rocks and sand. The Allihies–Ballydonegan Loop, part of the Beara Way, runs down to the shore with open Atlantic views and clear sightlines to the old mine workings, and the long-distance Beara–Breifne Way passes nearby.
The honest caveat: there is no lifeguard, and this is the open Atlantic, not a sheltered cove. The water can pick up quickly. It is fine for a paddle and a careful swim on a calm day, but check the conditions and keep an eye on children near the water.
Getting there
The beach sits about 2 km – roughly a 25-minute walk – south of Allihies, along a scenic coast road. Drive west to Allihies and follow the signs the rest of the way; there is free parking on site, but the spaces fill fast in July and August, so arrive early.
Without a car, Bus Éireann connects Castletownbere to Allihies (fare roughly €4–€8), with the Cork–Castletownbere bus costing about €12–€19. From Allihies you can walk the 2 km down or take a taxi for around €10–€15. Public toilets and a caravan and camping site are on site; there are no shops or cafés at the beach itself, so bring what you need.
Nearby
A short walk back into Allihies brings you to the Copper Mines Museum, the old forge and a couple of pubs serving food and music. North along the coast, Castletownbere is a working fishing harbour with waterfront restaurants and boat trips out to the Beara islands. Time your visit for late afternoon if you are after photographs: the low sun throws long shadows across the pale sand and sets it against the dark water.