A map of Singapore from the <a href="https://en.wikipedia.org/wiki/CIA_World_Factbook" class="extiw" title="w:CIA World Factbook">CIA World Factbook</a> with English labels.
National Foreign Assessment Center, <a href="https://en.wikipedia.org/wiki/Central_Intelligence_Agency" class="extiw" title="w:Central Intelligence Agency">Central Intelligence Agency</a>.
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<a href="https://en.wikipedia.org/wiki/CIA_World_Factbook" class="extiw" title="w:CIA World Factbook">CIA World Factbook</a>.