Sras Srang

The name translates to ‘Royal Bath’ and it was built in the second half of the 10th Century by King Rajendravarman, but unlike most of the lakes or bayans at Angkor it’s thought that this reservoir was once a natural lake, which is why it still holds water when most of the other lakes have dried up. It’s about 350 metres by 700 metres, so a generous sized swimming pool and probably difficult to keep clean, which is why Rajendravarman had signs put up warning people not to pollute it by letting their farm animals or elephants bathe in it.
A landing platform built at the western end of the reservoir was added to the layout in the 13th Century and is a popular spot for watching the sunrise. The dikes also received decorative sandstone cladding at the same time and the pool was shortened.

 Source:http://www.worldreviewer.com