Singapore, officially the Republic of Singapore, is an island country off the southern tip of the Malay Peninsula in Southeast Asia. It is a parliamentary republic. Singapore is the world's fourth leading financial centre and plays a key role in international trade and finance. Singapore is a major international transportation hub in Asia, positioned on many sea and air trade routes. Its official languages are English, Malay, Chinese (Mandarin), and Tamil, and its official currency is the Singapore dollar (SGD).