With the improvements in agriculture and the spike of agricultural yield, agriculture-based industries are built in large numbers. Today, the manufacturing industry is mainly concentrated around Tarsus, Adana and Ceyhan. Textile, leather tanning and food processing plants are plentiful. İsdemir is a large steel plant located in İskenderun. The petrochemical industry is rapidly developing in the region with the investments around the Ceyhan Oil Terminal. Petroleum refineries are being built in the area. Ceyhan is also expected to host the shipbuilding industry. Adana is the commercial center of the region where many of the public and private institutions have their regional offices. Mersin and Antakya are also home to regional offices of public institutions. Many industry fairs and congresses are held in the region at venues such as the TÜYAP Congress and Exhibition Center in Adana and the Mersin Congress Center. Mersin Seaport is the third largest seaport in Turkey, after İstanbul and İzmir. There are 45 piers in the port. The total area of the port is 785 square kilometres (194,000 acres), and the capacity is 6,000 ships per year. İskenderun Seaport is used mostly for transfers to Middle East and Southeastern Turkey. Ceyhan Oil Terminal is a marine transport terminal for the Baku–Tbilisi–Ceyhan pipeline (the "BTC"), the Kirkuk-Ceyhan Oil Pipeline, the planned Samsun-Ceyhan and the Ceyhan-Red Sea pipelines. Ceyhan will also be a natural gas terminal for a planned pipeline to be constructed parallel to the Kirkuk-Ceyhan oil pipeline, and for a planned extension of the Blue Stream Gas Pipeline from Samsun to Ceyhan. Dörtyol Oil Terminal is a marine transport terminal for Batman-Dörtyol oil pipeline which started operating in 1967 to market Batman oil. The pipeline is 511 km long and has an annual capacity of 3.5 million tons. While the region has a long coastline, international tourism is not at the level of the neighboring Antalya Province. There are a small number of hotels between Erdemli and Anamur that attracts tourists. Cilicia tourism is mostly cottage tourism serving the Cilicia locals as well as residents of Kayseri, Gaziantep and surrounding areas. Between Silifke and Mersin, high-rise and low-rise cottages line the coast, leaving almost no vacant land.