Recently renovated, the 18th Century, Jal Mahal (“Water Palace”) is
located in the middle of the Man Sagar Lake in Jaipur city, Rajasthan,
It long remained an abandoned dilapidated palace in the midst of the
sewage laden lake. With the urbanisation of Jaipur city and areas
surrounding the lake, the ecological system of the lake and its vicinity
A major clean up of the lake lasted 6 years and included re-alignment of city drains, de-silting and planting schemes.
More here and here. Photographs by Raj Gupta and here