KOLIN Insaat, Turizm Sanayi ve Ticaret A.S., through its subsidiaries, conducts its activities in construction-contracting, energy, port and shipyard management, mining, tourism and services, commerce, and industry sectors in Turkey. The company primarily undertakes highway, bridge, viaduct, railway, metro, tunnel, port, dam and hydroelectric power plant, and high-speed train projects, modern irrigation systems, purification systems, water transfer lines, flood structures, industrial complexes, pipeline constructions, military facilities, and building and house projects, hotel, hospital etc.