Sunday, January 8, 2017


Sarıyer - İstanbul - Turkey

GPS : 41°20'50.0"N 28°34'04.0"E / 41.347222, 28.567778

Terkos Lake / Sariyer - Istanbul - Turkey photo terkos_lake116.jpg


It's 50 kilometers to the north of Istanbul on the Black Sea coast, having an area of 25 square kilometers and surrounded by small forests. The lake is fed by Istiranca river so its waters are fresh. It's one of the main fresh water sources of Istanbul using huge pipes connecting to the main water distribution center of the city.

The excessive water from the lake is discharged to the sea, if needed. Nearby the lake, there is a small village bearing the same name of the lake. Fresh water fishing and goose hunting is also possible with special regulations at and around Terkos Lake. There are a couple of country style small hotels around it, and attracts many local people especially during summer weekends.

It is situated in 50 km north -west of Istanbul in the Thrace region, behind the Karaburun. Terkos Lake which is also called Durusu Lake has 25 km square surface area. The deepest place of the lake is eleven meters. Catchment area of the lake is 619 km2. Although it is 2.75 meter higher than the sea level, it does not flow to Black Sea.

Reception Basin of Terkos Lake is small, but there are many runnels carrying water to the lake. Among these runnels, Istrance Runnel carries the most water. After the lake was separated from the sea, its water has become sweet. Approximately 196 million meter cube water enters into Terkos Lake annually. In high rainfall periods this water quantity rises to 237 million meter cube.

Terkos Village is situated near the lake. The lake is named after this village. The village dates back to the year 1000. It was built on the lakeside in the northwest direction of today’s village as a pirate’s bay by the Genoese, on the peninsula known as the inner fortress. It is seen that then the sea and the lake was in contact, but then they were separated by the natural factors. We understand from the remains of the fortress on the peninsula that there was a monastery called Trikos in the inner part of the fortress and that the village and the lake are named after this monastery.

A French ambassador who came to Istanbul in the 19th century sees the drought in the city and invites a delegation from the Ottoman Court to France. The French claim that the water-related problems in the city can be solved indeed. They show the Terkos Lake as a water resource in the sketches they have drawn. The foundations of the today’s factory building is laid in the year 1855 and following the completion of the factory’s construction in 2 years, water is supplied to Istanbul.

These facilities which have been supplying water to Istanbul for a hundred years still exist. The water is taken from the lake and after being purified in the facilities in Kagıthane, is distributed in Istanbul. Since the drought and the population in Istanbul have been increasing in recent years, the water obtained from the probes on the seaside is discharged to the Terkos Lake through pumps in order to meet the water need of the city.

In addition, The Terkos Lake is fishing and hunting place where various wild birds live. Durusu is among the favorite places of hunters. Fishing and bird hunting is available during the hunting season. However only wild duck and goose hunting is allowed. It is forbidden to shoot bird species such as black morass, coot, heron, pelican, and pheasant. The fish variety of the lake is: freshwater perch, salmon, pike, trout, roach, and carp. The lake is shallow and surrounded by rushes and touring by motorboat is not allowed. However there are boats for rent for you to row on the lake.


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