<P> The vocabularies of the different regions also differ, as certain words mean different things in different regions . For example, the word mận refers to two different fruits: it is used for Prunus salicina (a type of plum) in the North, while in the South it refers to Syzygium samarangense (the rose apple). Kinship terms are especially affected, as each term has a subtly different meaning in each region . In the South, the eldest child in a family is referred by the ordinal number 2, while in the North the number 2 refers to the second - eldest child . </P> <P> While the entire country lies in the tropics, there is quite a large difference in climate between Northern and Southern Vietnam . </P> <P> Northern Vietnam has a humid subtropical climate, with a full four seasons, with much cooler temperatures than in the South (which has a tropical savanna climate), as well as winters that can get quite cold, sometimes with frost and even (rarely) snowfall . The lowest temperature reached in Hanoi was 2.7 ° C in 1955 . Snow can even be found to an extent up in the mountains of the extreme Northern regions in places such as Sapa and Lạng Sơn . </P> <P> Southern Vietnam, with its much hotter temperatures, has only two main seasons: a dry season and a rainy season . </P>

When did vietnam separated into north and south