| Tyligul Estuary | |
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| Location | Black Sea |
| River sources | Tyligul River |
| Ocean/sea sources | Atlantic Ocean |
| Countries | Ukraine |
| Max. length | 60 km |
| Max. width | 4.5 km |
| Surface area | 135 км² |
| Average depth | 5 m |
| Max. depth | 21 m |
| Salinity | 14-23 ‰ |
| Settlements | Kobleve |
Tyligul Estuary (Ukrainian: Тилігульський лиман, Turkish: Deli Göl) is an estuary of the Tyligul River. Located in the south of Ukraine. The name of the water body has origine from Turkish: Deli Göl, means "mad, rabid lake". The estuary has length 80 km, width 0.2—3.5 km, depth up to 19 m. The isolation of the estuary from the Black Sea was in 18-19-th senturies. Now it is isolated from the see by 7-km long and 4-km high shoal. The shoal is covered by solonchaks and small lakes. The estuary has periodical connection with the sea via narrow canal. Thanks to the canal the water level in the estuary is same as in the Black Sea.
On the shoal of the estuary and on the nearby water area, the ornithological Nature reserve «Tyligulsky Peresyp» is organised.
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In total, 118 species and taxa of microalgae are registered in the Tyligul Estuary: Diatom algae - 51 species, Dinophyta - 31 species, Chlorophyta - 13 species, Chrysophyta - 8 species, Cyanobacteria - 7 species, Cryptophyta - 6 species, Euglenophyta - 2 species.
There are 20 taxa of zooplankton are registered in the estuary at this time. Most numerous are copepods Acartia clausi and Calanipeda aqua-dulcis.
In different years there are 63 species of fish are mentioned for the water body. In consists 7 introduced species. The basic commercial fish in the estuary every time were gobies, sand-smelt, and Black Sea sprat. Until 1979 the fish such as roach, zander, carp, goldfish were fished numerously in some year. Now the setuary is place of fishing of the haarder, which comes from the sea through the canal, and also sand-smelt and gobies.
Turistic and commercial infrastructure on the coasts of the Tyligul Estuary is not developed, almost absent. Even in summer the numer of turists is relatively low. The numerous privat houses (dachas) are build on the coasts of the estuary (on the western coast). The bottom of the estuary is covered by black mud, or peloid. The sourses of peloid is about 14 mln. tonns.
On the western coast of the Tyligul Estuary is a village Petrivka, previously Pokrovske, where the castle of Ivan Kuris is located.