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United Kingdom
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South Wales

Lisvane

Top 12 Natural Monuments around Lisvane

Best natural monuments around Lisvane include significant natural landmarks and green spaces with ecological value. The area features diverse habitats, including the Lisvane & Llanishen Reservoirs, which are recognized as a Site of Special Scientific Interest (SSSI) for their importance to overwintering birds and diverse fungi. Woodlands like Rhyd-y-Pennau and Gwern-y-Bendy offer additional natural exploration. The landscape around Lisvane is characterized by hills, rivers, and protected natural areas, providing opportunities for outdoor activities and wildlife observation.

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Last updated: August 11, 2026

Twmbarlwm Hill and Iron Age hillfort

Highlight • Historical Site

Twmbarlwm is a 1,375 foot (419 m) hill that is rich in beauty, history and folklore. From the summit, you are afforded wonderful views of the Severn Estuary. There is an Iron Age hill fort on the summit, too.

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Mynydd Machen Summit

Highlight • Viewpoint

Mynydd Machen is a 1,188-foot (362 m) hill in South Wales which affords glorious views over Newport, Cardiff, Steep Holm, Flat Holm, Brean Down, and the Severn Estuary. The summit …

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Garth Summit

Highlight • Viewpoint

Stunning little hill with commanding views just outside Cardiff with a trig pointed summit. It is a UK listed Marilyn.

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Radyr Weir

Highlight • Structure

A pretty weir of the River Taff, the Radyr Weir runs today as a hydro power scheme and a focal point of Radyr town. Many wild salmon and sea trout …

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Cefn Eglwysilan Trig Point

Highlight • Natural Monument

Cefn Eglwysilan is a hill in South Wales, the twin 1,253 feet (382 m) summits of which lie just over one mile (2 km) east of Pontypridd in Rhondda Cynon …

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Peter Turner
July 9, 2025, Mynydd Machen Summit

Nice ascent from Crosskeys, but watch out for very overgrown pathways on the Machen side. Great views from the top!

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The Garth has a nice flat top with views across the valleys. Lots of sheep grazing too (March). Also a number of mounds provide some cover from the wind if a break is in order

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Twmbarlwm is a prominent hill and archaeological site located near the town of Cwmcarn in South Wales. It is part of the Caerphilly County Borough and is known for both its natural beauty and historical significance. Here are some key points about Twmbarlwm: Key Features: Hillfort: Twmbarlwm is home to the remains of an ancient hillfort, dating back to the Iron Age. The fortifications, which include earthworks and ramparts, suggest it was a significant settlement during that period. Celtic Connections: The name "Twmbarlwm" is thought to derive from Welsh, with "Twm" being a diminutive of "Tudur" and "barlwm" referring to a mound or hill. The site is associated with Celtic history and mythology. Natural Beauty: The hill offers stunning views of the surrounding landscape, including the nearby valleys and mountains. It is a popular destination for walkers, hikers, and outdoor enthusiasts. Archaeological Significance: Twmbarlwm has been the subject of various archaeological studies, which have revealed insights into ancient settlement patterns, defensive strategies, and daily life in prehistoric Wales. Access: The hill is accessible via footpaths, making it a popular spot for local residents and visitors. There are several trails that lead to the summit, offering a rewarding hike. Cultural Heritage: The site is connected to local folklore and legends, contributing to its cultural significance in the region. Visiting: If you plan to visit Twmbarlwm, it’s a good idea to check local resources or hiking guides for specific trails and information about the area. The site is a great way to experience the natural beauty and historical richness of South Wales.

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Grace Mulligan
November 23, 2024, Radyr Weir

The weir spans the River Taff, which flows directly through the heart of South Wales. It's a nice place to stop and refuel with picnic benches and a peaceful atmosphere.

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A small summit above Risca. Known locally as the "Twmp" (the hump), the pimple or the nipple, due to the shape of the mound on the summit.

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The pretty Radyr Weir spans over the River Taff and is currently working as a hydropower scheme, providing energy locally. You may find wild salmon and sea trout near the weir, as well as cormorants and grey herons.

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plenty of free parking in Machen next to the village hall and library

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Twmbarlwm is a 1,375 foot (419 m) hill that is rich in beauty, history and folklore. From the summit, you are afforded wonderful views of the Severn Estuary. There is an Iron Age hill fort on the summit, too.

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Frequently Asked Questions

What unique natural features can I explore around Lisvane?

Lisvane is home to the significant Lisvane & Llanishen Reservoirs, which are recognized for their diverse habitats including grassland, woodland, and waterside environments. You can also find notable viewpoints like Garth Summit, offering commanding views, and the pretty Radyr Weir on the River Taff.

Are there any historical natural monuments in the Lisvane area?

Yes, the region features Twmbarlwm Hill and Iron Age hillfort, a 1,375-foot hill rich in beauty and history, with an Iron Age hill fort on its summit. The Lisvane & Llanishen Reservoirs themselves are also Victorian-era landmarks, adding a historical dimension to their natural appeal.

What kind of wildlife can I expect to see at Lisvane's natural monuments?

The Lisvane & Llanishen Reservoirs are a biodiversity hotspot. You can observe overwintering wildfowl like tufted ducks and pochards, diverse grassland fungi including rare waxcap species, and amphibians such as common toads, common frogs, and palmate newts. The area also supports grass snakes, otters, bats, and various common garden birds.

Are there family-friendly natural monuments or activities near Lisvane?

The Lisvane & Llanishen Reservoirs offer a woodland story trail and accessible bird hides, making them suitable for families. Radyr Weir is also considered family-friendly, providing a peaceful spot to observe wildlife.

Where can I find the best panoramic views of the region?

For stunning panoramic views, consider visiting Garth Summit, which offers commanding vistas just outside Cardiff. Another excellent spot is Mynydd Machen Summit, providing glorious views over Newport, Cardiff, and the Severn Estuary. Twmbarlwm Hill also offers wonderful views of the Severn Estuary from its summit.

What water-based activities are available at the natural monuments around Lisvane?

Llanishen Reservoir, part of the Lisvane & Llanishen Reservoirs, provides opportunities for stand-up paddleboarding, sailing, canoeing, kayaking, and open-water swimming. The water is clean, with no currents or tides, making it ideal for these activities.

Are there accessible trails for visitors with limited mobility?

The Lisvane & Llanishen Reservoirs feature 5km of circular paths and accessible bird hides, designed to be enjoyed by a wide range of visitors.

What are some popular hiking routes near Lisvane's natural monuments?

You can find various hiking routes around Lisvane, including the 'Rhymney Valley Ridgeway and Caerphilly Mountain' route or the 'Llanishen Reservoir loop from Lisvane'. For more details and options, explore the Hiking around Lisvane guide.

Can I go running on trails near the natural monuments?

Yes, there are several running trails available. Popular options include the 'Llanishen Reservoir loop from Llanishen' or the 'Llanishen Reservoir loop from Lisvane'. You can find more running routes in the Running Trails around Lisvane guide.

What facilities are available at the Lisvane & Llanishen Reservoirs?

The Lisvane & Llanishen Reservoirs boast a modern two-storey visitor centre with spectacular views, a café serving Welsh produce, meeting rooms, and a Grab & Go service. There are also bird hides and 5km of circular paths.

When is the best time of year to visit the natural monuments around Lisvane?

The Lisvane & Llanishen Reservoirs are particularly notable for overwintering wildfowl, making late autumn and winter excellent for birdwatching. However, the diverse habitats and recreational activities can be enjoyed throughout the year, with spring and summer offering pleasant conditions for walking and water sports.

Are there options for mountain biking near Lisvane's natural monuments?

Yes, mountain biking opportunities exist in the wider area. Routes like 'Garlic Run Trail – Mynydd Rudry loop from Caerphilly' or 'Gwaelod Y Garth Inn – View From Garth Mountain loop from Nantgarw' are available. Consult the MTB Trails around Lisvane guide for more options.

What makes the Lisvane & Llanishen Reservoirs ecologically significant?

The Lisvane & Llanishen Reservoirs are designated as two statutory Sites of Special Scientific Interest (SSSI) for their national ecological value. Lisvane Reservoir SSSI is important for overwintering wildfowl, while the embankments are noted for diverse grassland fungi, including rare waxcap species. Much of the surrounding area is also a Site of Importance for Nature Conservation (SINC), supporting large populations of common toads and rare water plants.

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Extend your search for the best caves by checking out these guides of the top ones around Lisvane:

YstradfellteMaescarCrayLlywelTawe-UchafLlangynidrLlanfrynachThe Vale Of GrwyneyGlyn TarellCymer And GlyncorrwgOnllwynGlynneathBlaengwrachSeven SistersTalybont-On-UskLlangattockResolvenCrickhowellLlanfihangel Cwmdu With Bwlch And CathedineBreconYstradgynlaisTrallongPembrokeshireYscirLlanddewMonmouthshireLlangorsHonddu IsafLlanveynoePort EynonLongtownIlstonPenriceReynoldstonTalgarthSwanseaLlangennith, Llanmadoc And CheritonRhossiliLlanrhidian LowerLlanrhidian HigherLlanigonGwernyfedBronllysBlaenavonFelin-FachCrynantPennardUpper KillayAbersychanCraswallCarmarthenshireBedwas Trethomas & MachenMichaelchurch EscleyMumblesRudryCaerphillyVanLlanbradachGowertonCwmllynfellRhiwbinaPenyrheol Trecenydd & EnerglynCockettPontardawePontprennauAber ValleyPentyrchTongwynlaisMaesycwmmerYstalyferaWhitchurchRadyr and MorganstownGelligaerWalterstoneGwaun-Cae-GurwenVale of GlamorganPeterchurchCeredigionPen TranchPengamPontllanfraithNelsonCyncoedPentwynLlanishenSt. MargaretsArgoedOld St MellonsCefn FforestHeathCilybebyllNeath Port TalbotNewtonPenmaenBlackwoodTenbyPelennaClyne And MelincourtCrumlinBishopstonSkettyKillayDunvantBargoedAbbey DoreVowchurchTurnastoneLlancilloRowlstoneYnysdduRhondda Cynon TafCathaysLlandaff NorthGwynfi And CroeserwNewbridgeBactonMawrBrynDulasCwmavonHenllysRisca WestRisca EastAbercarnRoathPenylanEwyas HaroldMargamBriton FerryNeathUplandsLlwchwrNew InnTrevethinMargam MoorsCaerphillyFairwaterCardiffCastleTownhillCrosskeysPontymoileCoedffrancDyffryn ClydachBlaenhonddanTonnaLlanwrtyd WellsMarloes And St. BridesUpper CwmbranPontnewyddCwmbran CentralLlantarnamTai-BachPenderrySandfields EastPort TalbotAberavonKentchurchBaglan MoorsBaglanSandfields WestBaglan BayCroesyceiliogPonthirLlanyrafonPantegBirchgroveLandoreCwmbrwlaMynyddbachSt. ThomasBon-Y-MaenLlangyfelachClydachKenderchurch

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