The Syvash or Sivash (Russian and Ukrainian: Сива́ш; Crimean Tatar: Sıvaş or Сываш, "dirt"), also known as the Putrid Sea or Rotten Sea (Russian: Гнило́е Мо́ре, Gniloye More; Ukrainian: Гниле́ Мо́ре, Hnile More; Crimean Tatar: Çürük Deñiz or Чюрюк Денъиз), is a large system of shallow lagoons on the west coast of the Sea of Azov.