The Caspian Sea is the deepest of all the salt lakes.

里海是所有咸水湖中最深的。

The Caspian Sea is the largest of all the salt lakes.

里海是所有咸水湖中最大的。

The ecosystem of the Caspian Sea is very unique.

里海的生态系统非常独特。

Fishermen often catch sturgeon in the Caspian Sea.

渔民经常在里海捕捞鲟鱼。

The borders of many countries touch the Caspian Sea.

许多国家的边界都接壤里海。

Many countries border the Caspian Sea, including Russia and Iran.

许多国家与里海接壤，包括俄罗斯和伊朗。

The Caspian Sea is the largest saltwater lake in the world.

里海是世界上最大的咸水湖。

The waters of the Caspian Sea are very important for fishing.

里海的水域对渔业非常重要。

The climate around the Caspian Sea can be quite harsh in winter.

里海周围的气候在冬季可能会非常严酷。

The Volga flows through central Russia and into the Caspian Sea.

伏尔加河流经俄罗斯中部，最终注入里海。