Kawah Putih lake (7.10° S 107.24° E) is one of the two craters which make up Mount Patuha, an andesitic stratovolcano (a “composite” volcano). Mt Patuha is one of numerous volcanoes in Java. The Kawah Putih site was opened to visitors in 1987. The lake itself is 2,430 meters above sea level so the local climate is often quite chilly (temperatures are frequently around 10 degrees celsius). This makes a brisk change from the humidity of the north Java plain and the capital city of Jakarta. Kawah Putih is a sizeable acid lake which changes colour from bluish to whitish green, or brown, depending on the concentration of sulfur and the temperature. The sand and rocks surrounding the lake have been also washed into whitish colours by the vapours from the lake.
The lake is said to have been discovered in 1837 by Dr Franz Wilhelm Junghuhn, a German botanist who carried out a considerable amount of research in Indonesia until his death in Lembang, just north of Bandung, in 1864. At the time, there were various local stories about the history of the area. Birds were said to be reluctant to fly near the region and villagers in the area tended to regard the forest around the lake as eerie and somewhat mysterious. These stories prompted Dr Junghuhn to investigate. He discovered Kawah Putih. There was formerly a sulfur mine at the crater although production has now ceased. A sulfur plant known as the Zwavel Ontgining Kawah Putih was first established near the lake during the period of Dutch rule in Java. The plant was later taken over during World War II by the Japanese military and operated under the name Kawah Putih Kenzanka Yokoya Ciwidey. Entry points to various tunnels which represent the remnants of these mining activities can be seen at several points around the current site.
The surrounding area is heavily forested. There is a pathway down to the lake which is surrounded by the high walls of the crater nestling into the side of Mt Patuha. The smell of sulfur is strong because there is a good deal of steam and sulfurous gas bubbling from the lake. There are tracks around the lake and through the nearby forest including to the peak of Mt Patuha. Visitors may walk around the crater area or sit in the various shelters. Local plants not widely available in lower altitudes in Java include javanese Edelweiss and Cantigy (Vaccinium varingifolium). Animals and birds which may be spotted include eagles, owls, monkeys, mouse deer, and forest pigs. Panthers, leopards and pythons have also sometimes been seen in the nearby forest.
A range of simple facilities exists near the lake. There is ample parking, public toilets, and entrepreneurial vendors selling trinkets and food. The site is well-signposted. Local farmers often take the opportunity to sell strawberries (widely grown in the area), steamed corn, and various other items such as pumpkin seeds (pepita).
Kawah Putih and the surrounding area (where there are resort facilities such as hot spas) is a popular spot for people from Bandung. On weekends and on holidays, quite large numbers of Indonesian tourists visit Kawah Putih. The site is so far less well-known to international tourists. According to Perhutani staff at the site, up to 10,000 people can visit on busy holidays and the total number of visitors is perhaps 300,000 per year.
Source of information: http://en.wikipedia.org/wiki/Kawah_Putih