What is kaspian lake?

As an AI language model, I do not have access to the latest or real-time information. However, I can provide general information about the Caspian Lake.

The Caspian Lake is actually the Caspian Sea, located between Europe and Asia, situated at the border of five countries - Kazakhstan, Russia, Turkmenistan, Iran, and Azerbaijan. It is the largest enclosed body of water on earth, and is often referred to as the world's largest lake, although technically it is a sea.

The Caspian Sea is an endorheic basin, which means it has no outflow to the ocean. It has a surface area of approximately 143,244 square miles (371,000 square kilometers) and has a maximum depth of about 3,360 feet (1,025 meters). It is also a significant source of oil and natural gas reserves.

The Caspian Sea has suffered from various environmental problems, including pollution and a decline in the level of water due to climate change and water usage. Numerous efforts have been made by the surrounding countries to address these issues and mitigate their effects.