Regarded as the largest sea arch in Ireland, the Great Pollet Sea Arch is a natural rock formation created by the relentless crashing forces of the Atlantic Ocean over thousands of years through coastal erosion, initially forming a bridge with a sea cave and eventually detaching from the mainland. Reckoned as a popular destination for young and enthusiastic photographers and the sincere lovers of nature, the gorgeous arch is located on the Fanad Peninsula in County Donegal in Ireland, along the Wild Atlantic Way, a fascinating 2,500 km (1,553 mile) scenic coastal route in Ireland, stretching from Donegal to Cork, offering breathtaking views of the craggy coastline and the surrounding land and seascapes.

Reaching around 150 feet (around 46 m) above the crashing waves along the rocky headland, and separated from the mainland on the left due to coastal erosion, the spectacular Great Pollet Sea Arch is composed of quartzite rocks that formed during the late Precambrian period, between 2.5 billion and 541 million years ago, as part of the Dalradian Supergroup that was deposited on the eastern margin of Laurentia or the North American craton, between the late Neoproterozoic era, spanning from 1000 to 541 million years ago, and Early Cambrian period, covering from roughly 541 to 509 million of years ago.

Although the Wild Atlantic Way is the easiest approach, recently a newly built walkway of about 1,640 feet (500 m) was opened in April 2022, leading from a car park to the arch, offering a unique opportunity of lifetime to experience the dramatically beautiful as well as breathtaking views of the rugged coastline and the surrounding seascape. However, the walkway can be possibly used only by the young and physically able persons, as it is steep and uneven, especially the final section, involving a pebble beach and rocks.

However, although regarded as the most impressive sea arches in Ireland, offering most stunning sights, in recent years the Great Pollet Sea Arch has become notoriously difficult to access along the newly built walkway due to a combination of factors, which include landowner disputes, outdated signage, limited facilities like toilets or bins at the site, and a steep, gravelly path from the new car park. Consequently, visitors to the Great Pollet Arch mostly prefer the Wild Atlantic Way road trip route for its scenic beauty and easy access.

Nevertheless, in addition to the conventional Wild Atlantic Way and the newly built walkway, there is also another possible way to approach the Great Pollet Arch from the south of the sea arch, which is accessible only at low tide. However, in that case, the help of a local guide is essential to lead the visitor through the maze of farmland and potentially blocked turnstiles which surround the headland leading to the arch. Even then, as with any other coastal hike, extreme care must be taken when approaching the exposed cliff side over the headland, as the walkway down to the arch is steep and can be slippery, requiring sturdy footwear.