波拉波拉岛及其泻湖, 南太平洋, 法属波利尼西亚 Bora Bora and its lagoon, South Pacific, French Polynesia (© Frederick Millett/Shutterstock)

波拉波拉岛及其泻湖, 南太平洋, 法属波利尼西亚 Bora Bora and its lagoon, South Pacific, French Polynesia (© Frederick Millett/Shutterstock)

生于烈火，拥于碧水 Born on fire, held by water

国际热带日

“国际热带日”于每年6月29日纪念，旨在聚焦北回归线与南回归线之间那片广阔的区域——在这里，温暖的气候与充沛的降水塑造着人们的日常生活。该区域虽仅占地球表面积的约40%，却承载了全球约80%的生物多样性，对于地球生态健康与人类文化而言至关重要。

在法属波利尼西亚，波拉波拉岛生动地展现了这种复杂性。这座岛屿是一座古老火山经侵蚀后留下的核心部分，其深色的玄武岩山峰——奥特马努山（Mount Otemanu）和帕希亚山（Mount Pahia）——从浅浅的绿松石色海水中拔地而起。随着火山岩体缓慢下沉而珊瑚礁向上生长，环绕岛屿的堡礁围合出一片平静的水域，形成了一处泻湖。该岛在塔希提语中被称为“Pora Pora”（意为“长子”），既见证了漫长的地质演变，也承载着鲜活的文化，体现了语言、海洋生态系统与地貌特征之间紧密的联系。

International Day of the Tropics

Observed each June 29, the International Day of the Tropics spotlights a vast region stretching between the Tropics of Cancer and Capricorn, where warmth and rainfall shape daily life. This zone covers about 40% of Earth's surface area, yet supports around 80% of global biodiversity, making it central to planetary health and culture.

In French Polynesia, Bora Bora offers a clear snapshot of that complexity. The island is the eroded core of an ancient volcano, its dark basalt peaks—Mount Otemanu and Mount Pahia—rising from shallow turquoise waters. Around it, a barrier reef encloses calm water, forming a lagoon as volcanic rock slowly subsides and the reef grows upward. Locally called Pora Pora in Tahitian, meaning 'firstborn,' the island reflects both geological time and living culture, where language, ocean systems, and landforms remain closely linked.