National Highway 01 or NH01, formally called the Ring Road (Pashto: د افغانستان حلقوي سړک; Dari: شاهراه حلقوی افغانستان), is a 2,200 km (1,400 mi) two-lane and four-lane road network circulating inside Afghanistan, connecting the following cities (clockwise): Kabul, Maidan Shar, Ghazni, Qalat, Kandahar, Delaram, Herat, Qala e Naw, Maymana, Andkhoy, Sheberghan, Mazar-i-Sharif, Puli Khumri, Charikar, and back to Kabul. It has extensions that connect Jalalabad, Bamyan, Khost, Spin Boldak, Lashkargah, Zaranj (Route 606), Farah, Islam Qala, Torghundi, Ymamnazar, Hairatan, Kunduz, and Fayzabad. The Ring Road is part of AH1, the longest route of the Asian Highway Network. National Highway 01 consists of four major sections, NH0101 to NH0104, linking the major economic centers.