The system consists of a single 15.4 km (9.6 mi) long line running north from Darıca to Gebze.

The metro system will be the first network to exist outside of a provincial capital in Turkey, as Gebze and Darıca are located within the Kocaeli Province.

Most of the metro line will be underground, except for a 900 m (3,000 ft) section which will be at-grade.

A maintenance facility and a control center will be constructed at Pelitli, in north Gebze.

[2] Construction began in late 2018, but inauguration date has been delayed regularly.