The Bass Rock, or simply the Bass, is an island in the outer part of the Firth of Forth in the east of Scotland. Approximately 2 kilometres (1 mi) offshore, and 5 kilometres (3 mi) north-east of North Berwick, it is a steep-sided volcanic rock, 107 metres (351 ft) at its highest point, and is home to a large colony of gannets.
The island plays host to more than 150,000 northern gannets and is the world's largest colony of the species.
When viewed from the mainland, large regions of the surface appear white owing to the sheer number of birds.
In fact the scientific name for the northern gannet, Morus bassanus, derives from the rock. It was known traditionally in Scots as a "solan goose".
Much of the island is surrounded by steep cliffs and rocks, with a slope facing south south-west which inclines at a steep angle.
According to en.wikipedia