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D.400
D.400
Route information
	Part of E90
Length	2,057 km (1,278 mi)
Major junctions
West end	Datça
East end	Road 16 at Serow, West Azarbaijan
Location
Country	Turkey
Highway system
	Highways in Turkey; Motorways List; ; State Highways List; ;

D.400 is an east–west state road in southern Turkey. The 2,057-kilometre (1,278 mi) road starts at Datça in the southwest corner of the Anatolian peninsula and ends at the Iranian border at Esendere.

D.400 runs through the cities of Marmaris, Fethiye, Antalya, Alanya, Mersin, Adana, Gaziantep, Şanlıurfa, and Hakkâri and links to Road 16 in Iran. Between Nizip and Cizre, D.400 is part of the European route E90.

Itinerary

The table below shows the locations between Datça and Esendere.^[1]

Province	City	Distance from previous location	Distance from Datça	Distance from Esendere
Muğla	Datça	0	0	2,057
	Bozburun	51	51	2,006
	Marmaris	18	69	1,988
	Muğla	27	96	1,961
	Köyceğiz	33	129	1,928
	Ortaca	18	147	1,910
	Dalaman	5	152	1,905
	Fethiye	43	195	1,862
	Eşen [tr]	44	239	1,818
Antalya	Kalkan	36	275	1,782
	Kaş	26	301	1,756
	Demre	47	348	1,609
	Finike	28	376	1,681
	Kumluca	18	394	1,663
	Kemer	52	446	1,611
	Antalya	42	488	1,569
	Serik	42	530	1,527
	Manavgat	36	566	1,491
	Alanya	60	626	1,431
	Gazipaşa	44	670	1,387
Mersin	Kaledran	39	709	1,348
	Anamur	45	754	1,303
	Bozyazı	14	768	1,289
	Aydıncık	39	807	1,150
	Yeşilovacık	44	851	1,206
	Silifke	42	893	1,164
	Erdemli	46	939	1,118
	Mersin	38	977	1,080
	Tarsus	28	1,005	1,053
Adana
	Adana	42	1,047	1,010
	Misis	21	1,068	989
	Ceyhan	24	1,092	965
Osmaniye
	Osmaniye	51	1,143	914
	Bahçe	30	1,173	884
Gaziantep
	Nurdağı	21	1,194	853
	Gaziantep	62	1,256	801
	Nizip	45	1,301	756
Şanlıurfa
	Birecik	16	1,317	740
	Şanlıurfa	80	1,397	660
	Viranşehir	91	1,488	569
Mardin
	Kızıltepe	73	1,561	496
	Nusaybin	56	1,617	440
Şırnak
	Cizre	100	1,717	340
	Şırnak	46	1,763	294
Hakkari
	Hakkâri	183	1,946	111
	Yüksekova	70	2,016	41
	Esendere (Iranian border)	41	2,057	0
1.000 mi = 1.609 km; 1.000 km = 0.621 mi