Vietnam's climate, being located in the tropics and strongly influenced by the South China Sea has a monsoon-influenced tropical climate typical of that of mainland Southeast Asia. In the north, the climate is monsoonal with four distinct seasons (Spring, Summer, Autumn, and Winter) while in the south (areas south of the Hải Vân Pass), the climate is tropical monsoon with two seasons (rainy and dry). In addition temperate climate exists in mountainous areas, which are found in Sa Pa, Da Lat while a more continental climate exists in Lai Chau Province and Son La Province. The diverse topography, wide range of latitudes (Vietnam spans over 15° of latitude), and influences from the South China Sea lead to climatic conditions varying significantly between regions. 20% of Vietnam's total surface area is low-elevation coastal area making the country highly vulnerable to climate change effects and the rising sea levels in particular.