这里有中国为数不多的第四纪休眠火山群，溶岩景观丰富奇特。
There are a small number of Quaternary dormant volcanic groups in China, lava landscape rich and unique.
琼北第四纪火山区分布着为数众多、大小不一的射气岩浆喷发成因的低平火山口。
Maars of various scales produced by phreatomagmatic eruption are widely distributed in the Quaternary volcanic region of the Northern Hainan Island.
广泛分布于海南省北部的第四纪火山岩，至少有8次喷发活动。
At least 8 volcanic eruptions are recognizable in Quaternary volcanic rocks distributed in the Haikou area, Hainan Province.
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