Singapore is a tropical island country, consisting of a main island and 60 small islands. Its temperature changes little, rainfall is sufficient, and animals and plants multiply, which embodies the characteristics of tropical islands. Singapore's geographical position is one of the crossroads of the world. Unique geographical conditions make it develop into a major commercial, transportation, communication and tourism center. Located in the north of the equator136.8km, east longitude 103 36? To east longitude 104 25? , north latitude 1 09? To 1 29? The length between the main islands of Singapore is about 42 kilometers from east to west and 23 kilometers from north to south, with a total area of 682.7 square kilometers, including all islands. The larger islands outside the island are prout Airport (24.4 square kilometers), Pulauubin (10.2 square kilometers) and Sentosa Island (3.5 square kilometers).