By car
From Istanbul
you can either take D100 or O-4/E80 motorway/toll-road east to Izmit, then head west there along the southern shore of the Gulf of İzmit to Yalova, or take a ferry -which can accommodate cars- to Yalova. Once in Yalova, take D575/E881 highway south to Bursa. After about 30-40 km away from Yalova, you'll arrive in Orhangazi. At Orhangazi, you'll notice the junction of the secondary road lying on the northern shore of Lake İznik there are İznik/Nicaea signs. From that junction, İznik is about a 30-40 min drive away.If you choose not to take a ferry to Yalova, you also have the option of taking the mountainous road which forks from the main highway about 5 km west of Karamürsel. This road is shorter than the above route, but curvier.
From Bursa
Take D575/E881 highway north to Yalova. Somewhere between Gemlik and Orhangazi, you'll come across a junction with traffic lights. On that junction, you'll notice Ä°znik/Nicaea signs. That road will take you to Ä°znik along the southern shore of the lake in about 30-40 minutes.By ship
While there are no boats plying on Lake Ä°znik, when arriving from Istanbul in the north, you may take fast ferries (http://www.ido.com.tr/en/...) to Yalova to shorten total journey duration.
By Minibus
There are minibuses, mostly running on the road following the southern shore of the lake, heading to Ä°znik from all surrounding towns.
The minibuses are run by Ä°znik Minibüs ve Otobüsçüler Koop. â +90 224 757-16-48 (Ä°znik, +90 262 414-99-49 Gölcük, . ) with 20 min intervals between 8AM-midnight from Bursa, about an hour intervals between 7:30AM-9PM from Yalova except Su when the first departure is at 9:10AM; costs 7.50 TL pp as of 2008, and three times a day at 10:30AM, 3PM, and 7PM from Gölcük just west of Ä°zmit via Karamürsel.
By train
The nearest train station is located in Osmaneli, about 30-40 km to the east. Osmaneli lies on the main trunk rail line between Istanbul and Ankara, therefore many daily trains have a stop at the town.
Minibuses run by Ä°znik Minibüs ve Otobüsçüler Koop â +90 228 461-30-30 (Osmaneli. ) connect Osmaneli with Ä°znik, six times a day, with two-hour intervals between 8:30AM-6:30PM, except in winter when the last minibus departs at 5:30PM from Osmaneli.