Great limestone sea arch on the Castlemartin coast.
The Green Bridge of Wales is a limestone sea arch on the Castlemartin coast, standing about 24 metres high with a span of more than 20 metres — the best-known natural arch in Pembrokeshire. It’s reached along the coast path past the Elegug Stacks, but sits inside the Castlemartin firing range, so check the range is open to the public before you go. There’s a viewing platform above it.
