Tırmıl (also Tırmıl Höyük) is an tumulus (Turkish: höyük) in Mersin, Turkey.


The tumulus is in the urban fabric of Mersin at about 36°49′33″N 34°39′44″E. It is located on top of a low hill with a circular area of about 130 metres (430 ft) radius. The grocery wholesales markets are to the west of the tumulus and newly developed cheap housing quarters of the city are to the east of the tumulus. But there is no modern structure on the tumulus. The bird’s flight distance between Tırmıl and Yumuktepe, the oldest ruin in Mersin, is about 6 kilometres (3.7 mi).


The site seems to be inhabited in the chalcolithic age. The settlement continued up to the medieval age. But it is not mentioned in any ancient or medieval document. Probably the first reference to the tumulus was by Sir Francis Beaufort in 1812 who placed his theodolite on the hill during his mission in southern Turkey coasts. (See Caramania) . He was unaware of its historical significance. The tumulus was discovered in 1951 by Veronica Seton-Williams


On the top of the tumulus the ruins of an ancient castle can be seen. Only two bastions one at the north east and one at the northwest are partially standing. There are traces of ancient pottery all over the tumulus


The name of the tumulus has been used as the name of the industrial site to the north of Tırmıl (Turkish: Tırmıl Sanayi Sitesi). The name is also used as the name of the first stop in the commuter trains from Mersin to Adana which is located to the south of Tırmıl.(see Adana-Mersin Regional)


The Tırmıl Ruins can be found in the Tırmıl factory complex in the Akdeniz İlçe on the eastern side of Mersin. Surrounded by factories and warehouses, seeing the remains of this ancient structure peaking through the mound can be a bit surprising!
These ruins are dated back to the chalcolithic age, though their exact time period is not known. Among the many stones surrounding this mound, many pieces of pottery and artifacts have been, and continue to be, found. If you pay attention, you may find some yourself (though taking them is illegal according to Turkish law)!
Of the remaining structure of the castle atop the mound, only two bastions remain. As to the history and importance of this castle, not much is known for sure, though some evidence from ancient texts indicate that this may be Kale-i Hebelleç.
From the top of the mound, there are great views of the whole of Mersin.
Visiting:  This site is easy to access from both the Mersin-Adana Road (D400) or the Serbest Bölge exit from the Otoban (151 Cd.).
Some steep hiking is necessary to reach to the top of the mound (which is not very tall), but if you walk to the south side of the hill and follow the goat paths, you should not have too much trouble.
I would recommend parking on the north side of the mound and walking around to the south side before ascending the hill.