Koh Samui is located in the Gulf of Thailand, about 35 km northeast of Surat Thani town. The island measures some 21 kilometres at its narrowest point, and 25 km at its longest. It is surrounded by about sixty other islands, which compose the Ang Thong Marine National Park (Mu Ko Ang Thong National Park) and include other tourist destinations.

The climate of Koh Samui has essentially two seasons; warm and tropical most of the year, with a short rainy season. Unlike Phuket and most of the rest of Southern Thailand which has a 6-month rainy season between May and November, Samui's weather is relatively dry for the vast majority of the year, with the rainy season being primarily confined to November. For the rest of the year, since the weather is tropical, when it does rain, it usually doesn’t last long; rain showers of 20–60 minutes are typical.

Interesting links:

http://www.kosamui.de/

http://en.wikipedia.org/wiki/Ko_Samui

http://de.wikipedia.org/wiki/Amphoe_Ko_Samui

http://fr.wikipedia.org/wiki/Ko_Samui

http://it.wikipedia.org/wiki/Koh_Samui

http://www.wetter.com/thailand/koh_samui/TH0ST0001.html

http://www.google.de/images?hl=de&safe=off&q=bophut%20koh%20samui&um=1&ie=UTF-8&source=og&sa=N&tab=wi