Original: In the main island of the Kingdom of Tonga , where the greater portion of the population reside within the capital Nuku'alofa , the word is often appended to the end of '' Tonga '' , making the word '' Tongatapu '' , where local use it as '' Sacred South '' rather than '' forbidden south '' .
Simplified: For example , the main island in the Kingdom of Tonga , where the capital Nuku'alofa is located and most of the population resides , is called '' Tongatapu '' .