Turkey is a transcontinental Eurasian country. Asian Turkey, which includes 97 percent of the country, is separated from European Turkey by the Bosphorus, the Sea of Marmara, and the Dardanelles. European Turkey comprises 3 percent of the country. The territory of Turkey is more than 1,600 kilometers (1,000 mi) long and 800 km (500 mi) wide, with a roughly rectangular shape. It lies among latitudes 35° and 43° N, and longitudes 25° and 45° E. Turkey's area, including lakes, occupies 783,562 square kilometers (300,948 sq. mi), of which 755,688 square kilometers (291,773 sq. mi) are in Southwest Asia and 23,764 square kilo-meters (9,174 sq. mi) in Europe. Turkey is the world's 37th-largest country in terms of area. The country is encircled by seas on three sides: the Aegean Sea to the west, the Black Sea to the north and the Mediterranean to the south. Turkey also contains the Sea of Marmara in the northwest.
According to the Address-Based Population Recording System of Turkey, the country's population was 74.7 million people in 2011, nearly three-quarters of whom lived in towns and cities. According to the 2011 estimate, the population is increasing by 1.35 percent each year. Turkey has an average population density of 97 people per km². People within the 15–64 age groups constitute 67.4 percent of the total population; the 0–14 age group corresponds to 25.3 percent; while senior citizens aged 65 years or older make up 7.3 percent.
The economy has been transformed from predominantly agricultural to one in which industry and services are the most productive and rapidly expanding sectors. A decade into the 21st century, the services sector en-gaged about one-half of the workforce, while agriculture and industry each occupied about one-fourth.