The Danube flows into the Black Sea forming the Danube Delta which is a reservation of the Biosphere.

多瑙河流入黑海，形成保护生物圈的多瑙河三角洲。

youdao

The Danube flows into the Black Sea forming the Danube Delta which is a reservation of the Biosphere.

多瑙河流入黑海，形成保护生物圈的多瑙河三角洲。

youdao