Malaysia is a rich water resource country thanks to its high rainfall. The weather is characterized by two monsoon regimes – the Southwest Monsoon from late May to September, and the Northeast Monsoon from November to March. The Northeast Monsoon brings heavy rainfall, particularly to the east coast states of peninsular Malaysia and western Sarawak, whereas the Southwest Monsoon normally signifies relatively drier weather. The country depends heavily on surface water, mainly rivers, lakes, wetlands and reservoirs for water supply, which presently constitute 98% of total water supply.