The south coast of Java faces the Indian Ocean, so it is exposed to large swells generated by low pressure systems circling Antarctica, many thousands of kilometers to the south. G-Land is situated on the eastern side of the Bay of Grajagan, so it has a westerly aspect; i.e. at right angles to the predominant swell direction. As a result, swell wraps around the point and into the eastern side of the bay, producing long, walling left-handers, which peel at a rapid rate along a half kilometer stretch of shallow coral reef, forming perfectly hollow tubes that remain open the whole way.
Video: G-Land Diaries