We came by another sightseeing spot which was not in our plan but the boatman of the sightseeing boat recommended us to visit. It was the crater of a dormant volcano, Mt. Kasayama, whose lava is considered to have formed flat islands closely off the coast. The pond in the following picture is also considered to be the vestige of the eruption. The pond seems to be connected to the sea and the water is supplied and circulated from the sea. Fishes in the pond were sea fishes and they apparently formed their closed ecosystem in the pond. To my regret, fishing in the pond was prohibited.
(Vocabulary)
boatman 船頭; 貸しボート屋（の主人）
vestige 痕跡, 名残
They want to destroy every vestige of colonialism.
彼らは植民地時代の痕跡をすべて破壊したがっている．
ecosystem 生態系
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