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A
lava flow that
occured about 5 000 years ago on the Tafua peninsula south coast of Savai'i has created a rugged
coastline with dramatic scenery. Blow holes are common along this
type of coastline.
Most
of the Samoan coastline is protected by coral reef even though much of it is
exposed to the forces of the ocean swells. The most recent lava
eruptions occurred on Savai'i where a barrier reef has not yet
developed and long stretches of the coastline are exposed to the
ocean swells.
Upolu island has an older geology
than Savai'i although this only counts for the surface geology and
it's unknown which of the islands emerged first. The norheast
coastline of Upolu island is generally steeper than other parts of
Samoa whereas the mountains on Savai'i are more gently sloping but
reach higher altitudes at the centre of the island.
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