Thailand has a total area of 513,120 km2, stretching 2515 km from north to south, and 1257 km at the broadest point. It is host to a variety of natural tropical habitats. The northern region is forested and mountainous, crowned by Mount Inthanon, Thailand’s highest peak, at 2,565 metres. The central plains region, is a green and fertile area comprising the delta of the Chao Phraya River. The north-eastern region is a sandstone tableland, drier than other parts of Thailand. The southern region varies from rolling to mountainous terrain, stretching between the Andaman sea and the Gulf of Thailand. The climate is monsoonal, marked by a rainy season lasting from about April/ May to September/October and a relatively dry season for the rest of the year.