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Namtok Khao Chamao or Namtok Khlong Nam Sai  This crystal clear waterfall is one kilometre before the national park. The waterfall comprises seven levels, stretching for three kilometres. The large pond called Wang Matcha, is a habitat of brook carp.
History:
Located near the headquarters of Khao Chamao National Park, Khao Chamao-Khao Wong waterfall is a splendid affair – the waterfall has a number of tiers pushing high into the skyline and with crystal-clear water cascading into a variety of pools below. As the water is so clear many varieties of fish can be seen from the sides of the pools. In all the waterfall covers and area of around three kilometres. For those who want to spend some time in the area, accommodation in the form of bungalows and camping is available, although both must be booked in advance.

It is important to note that it this waterfall is only accessible on foot.

How to get there:
If you are in your own vehicle and travelling from Rayong take highway 3 to Klaeng district and go seven kilometres on to route 3377 to Nam Sai village. Turn right and drive one kilometre and you will come to the park headquarters. Buses leave from Rayong bus station for areas around the park every 10 minutes.

Geography:

This area was designated a park in 1975, becoming Thailand's 13th National Park. It covers an area of about 84 square km. Named after 2 mountains in Chantaburi and Rayong provinces. It provides an important watershed area for the agriculture of the region.

Tropical broad-leaved evergreen forests dominated the lowland elevations up to 1000m.

Climate

There is heavy rain from May to October about 3,000 mm. of rain per year, nicely cold from November to February, and summer from March to April with approximately 26-27 degrees Celsius all the year round.

Flora and Fauna

Animals that can probably still be found in the park include elephant, gaur, serow, bear, wild pig, deer, pileated gibbon and banded langur. There are also 53 confirmed bird species including the wreathed and great hornbills. "In the deep pools of Khao Chamao waterfall is found a species of carp (tor soro) which old timers in the area claim gave the Khao Chamao, which translates to get drunk its name.

They say people who eat the fish become light headed. A favourite food of the carp is the fallen fruit of a particular tree growing beside the waterfall. This fruit apparently has a mysterious property which has no visible effect on the carp but seemingly causes intoxication in people who eat the fish. This fruit, intriguingly, is a traditional curative for leprosy." (Gray, Piprell, Graham 1994)

Credit by : http://www.thaiforestbooking.com, http://www.discoverythailand.com