Hong Kong is surrounded by mountains, and the same can be said for the opposite – mountains are encircled by the city.  A good example is Grassy Hill, which is surrounded by Tsuen Wan, Sha Tin, and Tai Po New Town.  At an altitude of 647 metres, its summit looks out on several towns, which resembles toy bricks in the distance, and the rolling peaks of Pat Sin Leng.  A look towards Tsuen Wan includes a view of Shing Mun Reservoir sitting in a valley like a puddle.  The valley is formed by Grassy Hill, Needle Hill, and Tai Mo Shan, which is a popular route among hikers who want to challenge themselves.  In April, hikers can catch sight of butterflies like Tawny Mime fluttering around; in May, they can hear mating calls of adorable Chinese Francolin.