Pant y Sais National Nature Reserve, near Swansea

Wildlife haven close to industrial Swansea

What's here

Coronavirus update


The walking trail is open.


We are working hard to provide a safe and welcoming experience as our sites re-open.


Please take personal responsibility for your safety, making additional preparations ahead of your visit and abiding by the safety measures in place.


We have changed the normal route for some of our trails to help you maintain social distancing – please follow signs on site.


See our tips about how to plan for a safe visit. 


Pant y Sais National Nature Reserve shares many similarities with the nearby – but much larger – Crymlyn Bog to the west.

The reed and sedge beds are home to a range of wetland plants, birds and insects.

Running alongside Pant y Sais is the Tennant Canal. Along with a variety of birds and dragonflies, the banks of the canal are also home to the fen raft spider – Britain’s largest spider.

The best way to experience the reserve is to follow the boardwalk into the heart of the fen.

National Nature Reserve

Pant y Sais is a National Nature Reserve.

National Nature Reserves are places with some of the very finest examples of wildlife habitats and geological features.

There are over 70 National Nature Reserves in Wales.

Find out more about National Nature Reserves.

Wildlife highlights

The best time of year to visit Pant y Sais is during the summer, when the reserve is alive with the sound of bird song.

Reed warblers and sedge warblers breed here, along with Cetti’s warbler, grasshopper warbler, reed bunting and water rail.

Scarcer visitors, normally associated with the East Anglian fens, include bittern, marsh harrier and bearded tit.

Summer is also a good time to see the various wetland plants. Amongst the reed and sedges, special wetland flowers include yellow iris, marsh cinquefoil and greater spearwort.

Look out for the big clumps of royal fern – a Pant y Sais speciality.

Britain’s largest and rarest spider, the fen raft spider, lives here but you are much more likely to spot butterflies and dragonflies during your visit.

Closures and diversions

Please note:

  • Sometimes we need to close or divert trails for your safety whilst we undertake maintenance work or forest operations
  • Occasionally we may have to close a site in extreme weather, such as high winds or snow and ice due to the risk of injury to visitors or staff
  • Please always follow any instructions onsite and make sure you follow any temporary diversion signs in place

Walking trail

The walking trail is waymarked

Pant y Sais Walk

¼m, 0.5km, accessible

The circular boardwalk takes you into the heart of the fen. Please stay on the boardwalk when out on the fen as there is dangerous wet ground.

Other routes

From the other end of the boardwalk you can also follow the towpath which runs alongside the Tennant Canal. You can follow this along the whole length of Pant y Sais Fen, and beyond the reserve in either direction as far as Swansea or Neath.

The Wales Coast Path also passes the edge of the reserve.

Accessible facilities

The circular boardwalk is accessible to wheelchairs. The boardwalk leads from the B4290 – please take care crossing the road.

The other access to the reserve is along the towpath adjacent to the Tennant Canal. The towpath is not accessible to wheelchairs.

How to get here

Pant y Sais is located adjacent to the B4290, ½ mile from its junction with the A483.


Follow signs from the A483 to Jersey Marine village and the B4290. Take the B4290 into the village and, immediately after going over the canal bridge, turn left onto School Road (Heol yr Ysgol). There is limited parking on this residential road, please park considerately. Walk back to the B4290 and walk up the pavement towards the bus stop which is on the side of the road where the houses are. The entrance to the boardwalk is behind some railings. Please take care crossing the road.

You can also get to the reserve via the Tennant Canal towpath. You can join the towpath from the bridge on the B4290 near the entrance to Jersey Marine village.

Ordnance Survey map

Pant y Sais National Nature Reserve is on Ordnance Survey (OS) map 165.

The OS grid reference is SS 712 940.

Public transport

There is a bus stop opposite the entrance to the reserve boardwalk which has a regular service from Swansea and Neath.

For details of public transport visit

Find out more

Contact details

Tel: 0300 065 3000



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