The arch stands approximately 24 meters (80 feet) high.
It is part of the Pembrokeshire Coast National Park, Britain's only coastal national park.
The site is located within a Ministry of Defence (MoD) training range used for tank firing practice.
The nearby sea stacks, known as Stack Rocks or Elegug Stacks, are separated from the mainland by intense marine erosion.
The name 'Elegug' is the local Welsh word for guillemots, referencing the dense bird populations.
The limestone forming the arch dates back to the Carboniferous period, approximately 300 million years ago.
The Green Bridge of Wales is a large natural limestone arch spanning a 24-meter gap, situated along the Pembrokeshire coastline. It represents a significant geological formation created by the erosion of carboniferous limestone along a high-energy cliff line. The structure sits within the Castlemartin military training range, which dictates access limitations. Nearby sea stacks provide nesting grounds for large colonies of guillemots, razorbills, and kittiwakes. The site is accessible via the Pembrokeshire Coast Path. Constant wave action continues to shape the surrounding vertical cliffs and adjacent stacks.
The designated viewing platform near the parking area provides a direct vantage point of the arch without risking cliff-edge proximity.
Check the Ministry of Defence firing range schedule online before travelling to ensure the access road is open.
Bring binoculars to observe the nesting seabirds on the nearby sea stacks.
Stay on the designated gravel paths, as the cliff edges are unfenced and unstable.
Attempting to visit when the MoD firing range flags are raised or red lights are displayed, as the area will be restricted for safety.
Access is frequently restricted due to live military firing exercises; check the Castlemartin Range firing notice before arrival.
Wear sturdy, closed-toe walking shoes due to uneven, rocky terrain; keep dogs on a lead to protect ground-nesting birds.
