The largest port is La Goulette, located where the lake of Tunis opens into the gulf of Tunis. A railway link connects all the ports and with the Algerian rail network. More than half the road network is tarred, with ongoing upgrading and extending. Although the agricultural industry in Tunisia has shrunk, it nevertheless employs one third of the population. Tunisia is one of the largest exporters of olive oil in the world.
Fish is another important export and follows the exportation of olive oil.
Pollution is a threat to the industry. Manufacturing accounts for a fifth of the GDP and employs a fifth of the labour force. Textiles and leather goods account for a large proportion of manufacturing exports. Mechanical and electrical goods and chemicals are other growing industries. There are many international airlines which fly to Tunisia.