Some of the islands are built of volcanic rocks alone; such are Hongu-tonga and Hongu-hapai, which appear to be fragments of a single ancient crater, Tofua, Kao, Late, Metis, Amargua and Falcon Island.
There are two main divisions, the Lao Pong Dam ("Black Paunch Laos"), so-called from their habit of tattooing the body from the waist to the knees, and the Lao Pong Kao ("White Paunch Laos") who do not tattoo.
The Lao Pong Kao, or eastern branch, appear to have migrated southwards by the more easterly route of the Nam-u and the Mekong valley.
The Lao Pong Kao below 18° N.
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