Where is 三夏 or 三下 in China?

There is no such place called 三夏 (or 三下) in China.
However, there is a famous tourist centre called 三亞 ( Sanya) located at the southern tip of Hainan Island (海南省).

圖片參考：http://www.cctsbeijing.com/images/china-guide/china-city-guide/sanya/map-sanya.jpg


2009-04-18 16:49:51 補充：
Reference:

2009-04-18 16:51:32 補充：
http://www.cctsbeijing.com/city-sanya.html
http://travel.atnext.com/index.php?fuseaction=CityGuide.CityFact&cityID=336963

2009-04-19 17:06:32 補充：
It takes about 1.5 hour to fly to Sanya from Hong Kong.
Sanya is famous for her beaches and water activities.
There are many hotels and holiday resorts.
Don't forget to go to 天崖海角 and 鹿回頭 if you are going to Sanya.