Vietnam is located in the southeast of Indochinese Peninsula and covers an area of more than 330,000 square kilometers (128,000 square miles). The country has the shape of letter "S" and lies entirely in tropical region, between latitudes 8°27' and 23°23'N, and longitudes 102°8' and 109°27'E.
Vietnam's climate is typical for the tropics: the weather all around the year is in high temperatures and humidity. In particular, Vietnam's climate regions include two main climate regions: the North and the South with the boundary is Hai Van Pass.
Vietnam's topography is very diverse with mountains, hills, plains, coasts and continental shelf. It's result of tectonic process in a long time of millions of years in the past. The topography is lower from the northwest to the southeast. Thus, almost the rivers in Vietnam have the stream following that direction.