GTI has four members: People’s Republic of China, Mongolia, Republic of Korea  and Russian Federation. GTI member governments have committed to strengthen economic cooperation  and promote sustainable development, and attaining greater growth and sustainable development in Northeast Asia, and specially the Greater Tumen Region, which covers the three Northeast provinces (Jilin, Heilongjiang, & Liaoning) and Inner Mongolia of China; the Eastern Provinces of Mongolia; the Eastern port cities of the Republic of Korea and the Primorsky Territory of the Russian Federation.

With a skilled and low-cost labour pool, this region possesses enormous potential for investment and job opportunities. The Tumen River ties this region together, situated at the crossroads of vital trade, transport and energy routes. Rich in gas, oil and minerals, the region provides easy access to affluent markets in the Northeast Asian countries, representing millions of consumers.

   China  

Four provinces in China (Jilin, Heilongjiang, Liaoning and Inner Mongolia) are actively involved in GTI. Home to over 131 million, the four provinces make up an area of nearly 2 million km². These provinces are rich in natural resources – Inner Mongolia alone boasts 90% of the country’s proven rare earth oxides and five major coalfields with reserves of over 10 million tons each, while Heilongjiang produces almost half of the country’s oil and is a prime candidate for wind power development. Other resources like timber in Jilin and iron in Liaoning also play a large role in regional economy. Recent policies have emphasised the revitalisation of traditional industrial bases. Changchun in Jilin Province is home to one of the country’s major manufacturers, First Automobile Works, as well as automobile steel manufacturing center. Dalian in Liaoning Province is expected not only to become one of China’s five largest ports but also to rise as a global leader in software and service outsourcing. In this environment of growing industries and markets, the Tumen transport corridor stands as a vital connection for Northeast China and its neighbours.

 
     Mongolia

The three aimags (provinces) of Hentii, Dornod and Sukhbaatar form the Eastern Mongolian region involved in GTI. This large (287,600 km²) but sparsely populated area is relatively less developed. This is one of the largest, yet undisturbed steppe ecosystems in the world and is the core habitat of the Mongolian gazelle. As such, tourism is promising, thanks to the area’s pure natural beauty, cultural traditions and festivals. Currently, agriculture and forestry account for 33% of the country’s GDP, while transport and communications account for 10%, mining and quarrying (especially of copper, fluorspar, and molybdenum) for 9%, and manufacturing for 6%. Mongolia’s radically changing and privatising economy means that the government is placing high priority on developing the country’s natural resources processing sector and also on accessing regional transportation corridors.

    Republic of Korea

The Eastern port cities of ROK offer some of Northeast Asia’s most dynamic transportation and shipping connections, as well as accounting for significant tourist attractions. Busan, a city of around 4 million people, is a growing regional financial center and one of the largest container handling ports in the world with a capacity of 6.44 million TEU containers per year. Sokcho is an eastern coast port city in the Gangwon Province and a major tourist gateway to Northeast Korea, offering ferry and container transportation services to China, Russia and Japan. Ulsan is the industrial powerhouse of ROK, which is home to the world's largest automobile assembly plant, the world's largest shipyard, and the world's second largest oil refinery. Pohang is a major port city in North Gyeongsang Province and the home of the Pohang Steel Company, one of the largest steel producers in the world, and a host of related industries.

     Russian Federation

Primorsky Territory, rich in natural resources and with a strong industrial and transportation base, is the largest economy in the Russian Far East and the Greater Tumen Region. Formerly dominated by state-run enterprises, about 90% of the enterprises in Primorsky are now privately owned. Coal and non-ferrous metal mining, ship repair, ship building, and food processing are the largest industrial employers. The overwhelmingly export-based transport industry is also well developed. Five of the ten major Russian shipping companies are based in this area, and strong regional growth in recent years has resulted in greater export volumes, especially of metals and other resources. In addition to the port in Vladivostok, the end of the lines of the Trans-Siberian Railway in Nakhodka and Vostochny are also located in Primorsky. The TSR is one of the shortest routes between East Asia and Europe and is a major route for Japanese transit cargo.