The Caspian Sea: A ‘lake’ so huge it outsizes Japan and touches five nations

At first glance, the Caspian Sea appears as an ocean stretching endlessly to the horizon, lapping the shores of five nations. Yet scientists classify it not as a sea, but as Earth's largest lake, an immense inland body spanning roughly 371,000 square kilometres, surpassing Japan in size. Straddling Europe and Asia, it borders Russia, Azerbaijan, Kazakhstan, Turkmenistan, and Iran. Its vast expanse, peculiar chemistry, and geopolitical significance make it one of the planet's most captivating geographical wonders. From ancient Silk Road commerce to contemporary oil pipelines, the Caspian has profoundly influenced the region's historic, economic, and ecological narrative. Despite this, its hybrid lake-sea status, lucrative caviar trade, and pivotal role in global energy politics remain little known to the world.