《徐霞客游记·滇游日记十》
浴池分内池外池，外池本来就泉水清莹，内池泉水更加清澈，沐浴的人大多在外池。
池分内外，外固清莹，内更澄澈，而浴者多就外池。
The bathing pool is divided into an inner pool and an outer pool. The outer pool’s spring water is clear and sparkling, but the inner pool’s spring water is even clearer. Most people bathing are in the outer pool.