Mahamevnawa is an organization of monasteries established for the sake of spiritual development of human beings through the teachings of the Sakyamuni Buddha, guided by Venerable Kiribathgoda Gnananada Thera. 
It is named after the historical Mahamevna garden of Anuradhapura, the cradle of Dhamma in Sri Lanka.
Buddha Vision is the official English website of Mahamevnawa Buddhist Monastery, which currently has has around 40 monasteries  for meditation throughout Sri Lanka.

See also:
http://theravadin.wordpress.com/2012/05/21/a-dhamma-rain-shower-mahamevnawa/

http://dhammamedicine.net/articles/english-articles/