Maldives

Sri Lanka

Singapore

Brunei

Indonesia

Timor-Leste

Size : 5,765 square kilometres Population : 433,285

The Nation of Brunei , Abode of Peace – as it ’ s officially named – is a rich unitary Islamic absolute monarchy on the north coast of Borneo in Maritime Southeast Asia . It has 161 kilometres of coastline next to the South China Sea , and it shares a 381-kilometre border with Malaysia . It also has 500 square kilometres of territorial waters . Most of Brunei is within the Borneo lowland rainforests ecoregion .

Size : 1.9 million square kilometres Population : 270.6 million

Situated in Southeast Asia , Indonesia lies strategically between the Pacific Ocean and the Indian Ocean . The island country stretches for 1,760 kilometres from north to south and 5,120 kilometres from east to west . The number of islands making up the archipelago has been estimated to be over 18,000 . There are five major islands , namely Sulawesi , Borneo , Java , New Guinea , and Sumatra , and two primary archipelagos , the Maluku Islands and Nusa Tenggara , as well as 60 smaller archipelagos . Some of the islands are shared with other countries , including Borneo ( Brunei and Malaysia ), Timor ( East Timor ), and New Guinea ( Papua New Guinea ). Java is the most densely populated island in the archipelago , and in the world .

Size : 300,000 square kilometres Population : 108.1 million

The Philippines , an archipelago east of Vietnam , between the Philippine Sea and the South China Sea , boasts the highest portions of a partly submerged mountain chain . It is made up of more than 7,000 islands ; the three main island groups are Luzon , Visayas , and Mindanao . It is the fifth largest island country in the world , and its 36,289 kilometres of coastline makes it the country with the fifthlongest coastline in the world . At 10,540 metres deep , Galathea Depth in the Philippine Trench , located in the Philippine Sea , is the deepest point in the country and the third deepest in the world .

Size : 718 square kilometres Population : 5.9 million

Singapore consists of 63 islands , including the main island , Pulau Ujong , or Singapore Island , which is the world ’ s 20th most populous island and the 31st most densely populated island . There are two man-made connections to Johor , Malaysia : the Woodlands 1st Link in the north and the Tuas 2nd Link in the west . Jurong Island , Pulau Tekong , Pulau Ubin and Sentosa are the largest of Singapore ’ s smaller islands . Since 1822 , Singapore has continued to increase the area of the island through land reclamation , from 580 square kilometres in the 1960s to 718 square kilometres today .