- Sumatra (Wikipedia)
Sumatra (/sʊˈmɑːtrə/) is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 482,286.55 km2 (182,812 mi.2), including adjacent islands such as Simeulue, Nias, the Mentawai Islands, Enggano, the various archipelagoes comprising the Riau Islands Province, Bangka and Belitung and the Krakatoa archipelago.
- Landlocked (Wikipedia)
A landlocked country is a country that does not have territory connected to an ocean or whose coastlines lie solely on endorheic basins. Currently, there are 44 landlocked countries, two of them doubly landlocked (Liechtenstein and Uzbekistan), and three landlocked de facto states in the world. Kazakhstan is the world’s largest landlocked country, while Ethiopia is the world’s most populous landlocked country.