This is a multi-line transnational gas corridor system connecting Turkmen gas fields to China through Uzbekistan and Kazakhstan. The whole system consists of several projects by line and country section. The Line A, B, and C was completed, 1833 kilometres long. 188 km in Turkmenistan, 530 km in Uzbekistan, and remaining in Kazakhstan. The fourth line (Line D) was planned to be constructed but delayed for various reasons.