Singapore is an island country and a city-state in Southeast Asia. It comprises 63 islands， with Johor Strait separating it from the state of Johor on Malaysia's west coast. Singapore's territory has expanded since independence as a result of land reclamation projects， most notably to create Jurong Island， Marina Bay and the Sentosa Reclamation area (the latter named after Lee Kuan Yew). These have added approximately 50% to its total size.[1] The city proper encompasses the central core urban zone， home to the vast majority of the population； it is bounded by these geographical features：
The Straits of Johor at the southern tip of the Asian continent， forming one third of Earth’s tropical coral reefs biodiversity hotspot areas
Marina Barrage（水坝）， built across the mouth of the Singapore River where it flows into South China Sea
Kallang Basin， site of several rivers that flow through central Singapore
Sime Road Forest Reserve and Bukit Timah Nature Reserve， which together form part of the Central Catchment Nature Reserve. Located south of downtown Singapore and home to more than half of all native flora species found there. Together they cover about 2，874 hectares or about 17% of Singapore's landmass.
