The Syvash or Sivash (Russian and Ukrainian: Сива́ш; Crimean Tatar: Sıvaş, Cyrillic: Сываш, "dirt"), also known as the Putrid Sea or Rotten Sea (Russian: Гнило́е Мо́ре, Gniloye More; Ukrainian: Гниле́ Мо́ре, Hnyle More; Crimean Tatar: Çürük Deñiz, Cyrillic: Чюрюк Денъиз), is a large area of shallow lagoons on the west coast of the Sea of Azov. Separated from the sea by the narrow Arabat Spit, the water of the Syvash covers an area of around 2,560 km2 (990 sq mi) and the entire area spreads over about 10,000 km2 (3,900 sq mi). The Henichesk Strait is its eastern connection to the Sea of Azov. The Syvash borders the northeastern coast of the main Crimean Peninsula. Central and Eastern Syvash were registered as wetlands of Ukraine under the Ramsar Convention. Since the 2022 Russian invasion of Ukraine, the entire Syvash has been occupied by Russia.
|Location||Sea of Azov|
|Max. length||200 km (120 mi)|
|Max. width||35 km (22 mi)|
|Surface area||2,560 km2 (990 sq mi)|
|Average depth||0.5–1 m (1.6–3.3 ft)|
|Max. depth||3 m (9.8 ft)|
|Official name||Central Syvash|
|Designated||11 October 1976|
|Official name||Eastern Syvash|
|Designated||23 November 1995|
The Syvash nearly cuts the Crimean Peninsula off from the mainland, serving as a natural border for its autonomous republic. The long (110 km (68 mi)) and narrow (0.27–8 km (0.2–5.0 mi)) Arabat Spit runs to its east, separating it from the Sea of Azov. The two bodies are connected in the north at the Henichesk Strait beside the port of Henichesk. To its west, the isthmus of Perekop separates it from the Black Sea and connects Crimea to the mainland.
The Syvash is extremely shallow. The deepest place is about 3 meters (10 ft), with most areas between 1⁄2–1 m (1 ft 8 in – 3 ft 3 in) deep. The bottom is covered with silt up to 5 m (16 ft) thick. Being very shallow, the waters in the Syvash heat up in the summer and produce a putrid smell. The wide area for evaporation also leaves the water extremely salty. The amount of various salts is estimated at 200 million metric tons. Several industrial plants harvest the mineral resources of Syvash. The Syvash area is a wetland of international importance. The shores are low, slightly sloping, swampy and salty. In summer, the water level of Syvash decreases significantly, revealing barren solonets soils called "syvashes" by locals.
The Syvash is sometimes divided into the Western Syvash and Eastern Syvash. These are connected to each other by the Chongar Strait.
- "Central Syvash". Ramsar Sites Information Service. Archived from the original on 6 September 2015. Retrieved 25 April 2018.
- "Eastern Syvash". Ramsar Sites Information Service. Archived from the original on 9 December 2015. Retrieved 25 April 2018.
- Baynes, T. S., ed. (1878). Encyclopædia Britannica. Vol. 3 (9th ed.). New York: Charles Scribner's Sons. p. 169. .
- Siwaschsee. 3 September 2020. Archived from the original on 25 September 2014. Retrieved 10 May 2014.
- V. Siokhin; I. Chernichko; V. Kostyushyn; N. Krylov; Yu. Andrushchenko; T. Andrienko; Ya. Didukh; V. Kolomijchuk; L. Parkhisenko; R. Chernichko; T. Kirikova (2000). V. Siokhin; V. Kostyushyn (eds.). Sivash: the lagoon between two seas (PDF). ISBN 9058829960. Archived from the original (PDF) on 2014-05-12.
Media related to Syvash at Wikimedia Commons