Hunga Tonga地形图
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Hunga Tonga
The volcano itself is a submarine volcano that breached sea level in 2009 due to a volcanic eruption and lies underwater between two islands, Hunga Tonga and Hunga Haʻapai, which are respectively the remnants of the northern and western rim of the volcano's caldera. The caldera is roughly 150 m below sea-level, and rises 2000 m from the sea-floor. The two islands (part of the Haʻapai group) are about 1.6 km (0.99 mi) apart, and each is about 2 km (1.2 mi) long and composed largely of andesite. This andesite tends to be of the basaltic type. Hunga Tonga reaches an elevation of 149 m (489 ft), while Hunga Haʻapai comes to only 128 m (420 ft) above sea level. Neither island is large: Hunga Tonga was roughly 390,000 m2 (0.15 sq mi) and Hunga Haʻapai 650,000 m2 (0.25 sq mi) in size before they were connected. They are much smaller after the 2022 eruption. Neither island was developed due to a lack of an acceptable anchorage, although there were large guano deposits on each island.
关于这张地图
名称：Hunga Tonga地形图、海拔、地势。
地点：Hunga Tonga, Haʻapai, Tonga (-20.53613 -175.38324 -20.53490 -175.38020)
平均海拔：2 米
最低海拔：-1 米
最高海拔：135 米
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