Velocity
The fastest zip line on earth: over 1.5 km at more than 160 km/h, head-first above the quarry lake.
Unknown authorUnknown author — Public domain · Llywelyn2000 — CC BY-SA 4.0 · William Spreat — CC0 · Mike Hudson — CC BY-SA 3.0
The fastest zip line in the world is not in Dubai or New Zealand but above a half-worked slate pit on the northern rim of Snowdonia. It is called Velocity, marketed for years as Velocity 2: a cable over 1.5 km long on which you hang face-down like a hawk and cross the turquoise quarry lake at well over 160 km/h. The flight lasts about a minute, compresses a whole day of Welsh driving into one held breath, and the entire point is that you land before your brain has caught up. The site rewards a look even if you ride nothing. By the end of the nineteenth century Penrhyn was the largest slate quarry on earth; the main pit is roughly 1.6 km long and 370 m deep, it is still Britain's biggest working slate quarry, and the whole slate landscape of North Wales has been a UNESCO World Heritage Site since 2021. Around the big line sit gentler options: Quarry Karts, a 3 km downhill run on the old quarry tracks (age 15+, from about £45); Aero Explorer, a flying overhead track (min. height 1.25 m, from about £29); Quarry Flyer, two short parallel zips suitable for children from 1 m tall (from about £19); and a guided 90-minute quarry history tour by ex-army truck, ending with tea and a Welsh cake, from age 5 at around £25. The numbers that matter before you book: Velocity starts at about £99, a £5 booking fee is added to any booking, peak summer dates cost more, and booking one to three months ahead earns 5 to 15 per cent off. The experience takes a full two hours because you ride a small warm-up line first and are then carried 3 km up the quarry tracks in an ex-army truck. Rules: at least 1.2 m tall, no more than 130 kg, and under-18s need a participating adult (one adult per three children). Everything runs on timed slots; in July and August weekends sell out weeks ahead, so book on the official site early and arrive thirty minutes before your time. The site is entirely cashless, card or phone for every transaction, while the luggage lockers run on coins, so bring some change for those. Weather can cancel a session in any month, and rain here is a working assumption. Getting there: the quarry sits by the village of Bethesda on the northern edge of Eryri (Snowdonia), about 35 minutes by car from Betws-y-Coed along the A5, 15 minutes from Bangor and 20 from Llanberis. No practical public transport reaches the gate, so this is a hire-car outing. Family members who would rather not fly can sit in the Blondin Restaurant, which looks straight out over the pit, and watch riders streak over the lake, a genuinely entertaining half hour in itself. Not a place for anyone who fears heights or for a toddler in a pushchair, but for a family with teenagers who want something other than castles and lakes, this is the day they will remember from Wales.
The fastest zip line on earth: over 1.5 km at more than 160 km/h, head-first above the quarry lake.
The world's largest slate quarry by the end of the 1800s, 370 m deep and part of a UNESCO World Heritage landscape.
Quarry Flyer for children from 1 m tall, and the Blondin Restaurant overlooking the pit for those who prefer to watch.
Penrhyn Slate Quarry, Bethesda, Gwynedd LL57 4YG
Velocity requires a minimum height of 1.2 m and a participating adult for every under-18. Zip World publishes no minimum age for it, but the height rule puts it at older children and up in practice, and Quarry Karts is 15+. Younger children have Quarry Flyer from 1 m tall, but toddlers in pushchairs get only the restaurant and its view; if your party is all small children, it is not worth the detour.
Do not count on it. Everything runs on timed slots, and in July and August Velocity weekends sell out weeks in advance; driving 35 minutes to a full board is a poor use of a Welsh day. Book on the official site, and keep an eye on the wind and rain forecast because sessions are cancelled for weather.