Offshore islands "Motu"

Nu'usafe'e "Octupus Island" a secluded offshore island, south coast of Upolu

Most of the offshore islands in Samoa are remnants of old volcano craters of which some of them rises 200 m above sea level. Nu'usafee island off the south coast has a different geology. It's believed to have formed as a result of ground water seeping out through a submerged freshwater spring. The calcium carbonate rich coral sand has formed into rock after reacting with the fresh water. The island is only a couple of meters above sea level at its highest point. The offshore islands at Aleipata, Nu'utele, Namua, Fanuatapu and Nu'ulua are old volcano craters. 

More offshore islands: click on pictures