The TEA-4 terrestrial cable system is the latest serie of Rostelecom's TEA terrestrial cable route, including TEA, TEA-2, TEA-3 and TEA-4.

The TEA-4 connects Europe, Russia, Mongolia and China, through the China-Mongolia Border in  Erlianhaote (Erenhot).

The TEA-4 shortens latency from China to Europe via Rostelecom's backbone network, being comparable to the Europe-Russia-Mongolia-Asia (ERMC)  and the TMP Transit-Mongolia terrestrial routes.