[2] In contrast to its Chinese name, which means green hill, Castle Peak is notorious for its severe loss of vegetation and weathering of its granite surface.

Castle Peak is unique in that it is among the few prominent mountains in Hong Kong which are not inside a country park.

The granite are broken into smaller pieces, where they fall and accumulate on the less steep slopes in the west of the mountain.

As there are more steeper slopes on the eastern side, some of the debris would fall down there to the Tuen Mun Valley.

Legend has it that the monk had travelled over water in a cup and finally reached the Castle Peak.

Its former channel with Kau Keng Shan of an important sea route in South China.