46°9′36.97″N 34°47′33.72″E / 46.1602694°N 34.7927000°E
The Henichesk Strait (alternatively Genichesk Strait; Ukrainian: Генічеська протока, Crimean Tatar: Ceniske, Cengięke, Russian: Генический пролив,) is a narrow strait which connects the Syvash (the shallow lagoon system separating the Crimea from the rest of Ukraine east of the Isthmus of Perekop) with the Sea of Azov. It separates the Arabat Spit from the Ukrainian mainland.
The Arabat Spit (Ukrainian: Арабатська коса; Russian: Арабатская коса; Crimean Tatar: Arabat beli), or Arabat Arrow (Russian: Арабатская стрелка), is a barrier spit that separates the large, shallow, salty Syvash lagoons from the Sea of Azov. The spit runs between the Henichesk Strait in the north and the north-eastern shores of Crimea in the south. It is the largest of several spits of the Sea of Azov.
The Syvash or Sivash (Ukrainian and Russian: Сива́ш; Crimean Tatar: Sıvaş, Сываш, lit. 'dirt'), also known as the Putrid Sea or Rotten Sea (Russian: Гнило́е Мо́ре, romanized: Gniloye More; Ukrainian: Гниле́ Мо́ре, romanized: Hnyle More; Crimean Tatar: Çürük Deñiz), is a large area of shallow lagoons on the western edge 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 km (990 sq mi) and the entire area spreads over about 10,000 km (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. The 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.