Abstract: The paper addresses the issue of the state border. It emphasizes the fact that the state border is a multi-component and multifunctional phenomenon. It was proved that a legally established and internationally recognized border acquires a sign of politicality. The political boundary is a holistic and dynamic phenomenon, inherent in the internal logic of development. The issues of functioning and institutional support of state borders were generalized. The influence of state borders on the development of border territories was revealed. A scheme for the development and integration of contact border areas has been developed. The factors of contact border regions development were studied, as well as the process of various types of regional socio-economic systems formation under the condition of the predominance of state border certain functions. The importance of the functioning of state borders and the development of border regions for the formation of various types of ties, the level of stability of the border and the formation of a political environment have been clarified.