Located in the Bao'an district, being one of the top eight tourist destinations in Shenzhen city, the Yangtai Mountain is an important source of many of Shenzhen's rivers, and with over 10 reservoirs spread out around the base of the mountain. It's also an important source of much of the city's drinking water. The lush green valley is particularly beautiful during rainy seasons. Below the mountain is where the Hakka people live.
During every 'Double Ninth Festival', the traditional Chinese holiday dated the ninth day of the ninth month in the Chinese lunar calendar, the Yangtai Mountain is a customary place for local people to climb mountains, appreciate chrysanthemum flowers, drink chrysanthemum wine, and eat double-ninth cakes.
The festival began as early as the Warring States Period (475 BC-221 BC). According to the yin/yang dichotomy that forms a basis to the Chinese worldview, yin represents the elements of darkness and yang represents life and brightness. The number nine is regarded as yang. The ninth day of the ninth month is a double yang day, hence was named the Double Ninth Festival (Chong Yang Festival). (Chong means 'repeat' in Chinese.)
The ninth month also heralds the approach of winter. It is a time when the living needs warm clothing, and filial Chinese sons and daughters extended this to make the festival a time for providing winter clothes for their ancestors. The Double Ninth Festival, therefore, also became an occasion to visit the graves of dead family members. Clothes made of paper would then be burnt as offerings.
The Double Ninth Festival is also the 'Old Men Festival.' Old people are meant to improve their health by taking part in the activities on the day of the festival.
