The territory is 41 kilometers (25 mi) long, and from 6 to 12 kilometers (3.7 to 7.5 mi) wide, with a total area of 365 square kilometers (141 sq mi). With around 1.85 million Palestinians on some 362 square kilometers, Gaza ranks as the 3rd most densely populated polity in the world. An extensive Israeli buffer zone within the Strip renders much land off-limits to Gaza’s Palestinians. Gaza has an annual population growth rate of 2.91% (2014 est.), the 13th highest in the world, and is often referred to as overcrowded. The population is expected to increase to 2.1 million in 2020. By that time, Gaza may be rendered unliveable, if present trends continue. Due tothe Israeli and Egyptian border closures and the Israeli sea and air blockade, the population is not free to leave or enter the Gaza Strip, nor allowed to freely import or export goods. Sunni Muslims make up the predominant part of the Palestinian population in the Gaza Strip.