What is recorded here

Porth Twr-mawr is shown as a bay on the public map of Gwynedd. The saved point is the map point or the centre of its mapped shape.

Porth Twr-mawr is a coastal bay in Gwynedd, featuring sea cliffs and rocky outcrops composed primarily of Silurian greywacke and volcanic rocks. These rocks formed around 440–420 million years ago through sedimentation and volcanic activity, and are notable for their resistance to erosion, shaping the rugged coastal landscape of northwest Wales.

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