Tajikistan is a presidential republic consisting of four provinces. Most of Tajikistan's population belongs to the Tajik ethnic group, who speak Tajik language — the first official language. Russian is used as the official inter-ethnic language. While the state is constitutionally secular, Islam is practiced by 98% of the population. In the Gorno-Badakhshan oblast, despite its sparse population, there is large linguistic diversity where Rushani, Shughni, Ishkashimi, Wakhi and Tajik are some of the languages spoken. Mountains cover more than 90% of the country. It is a developing country with a transition economy that is highly dependent on remittances, aluminium and cotton production. Tajikistan is a member of the United Nations, CIS, OSCE, OIC, ECO, SCO and CSTO as well as a NATO PfP partner.