August 21 is the day of the Caspian Sea/Mazandaran, which unfortunately faces the serious risk of water loss and environmental catastrophe in the future, Mousavi wrote in Farsi on his account on the X, formerly known as Twitter, on Monday.
All five littoral states are obligated to take measures to save their health, security, and economy plus the region, regardless of any reservations and before the situation in the Sea further deteriorates, he added.
The warning came hours after the Iranian Space Agency (ISA) said it had used satellite imagery to assess the status of the Caspian Sea as the world's largest lake as it confirmed its water levels are diminishing.
ISA studies show that water levels in the northern part of the Caspian Sea have been diminishing over the last two years.
It said, however, that the decline in water levels in the Caspian Sea has been lower in its southern coasts which borders Iranian territories.
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