The area roughly located between the Danube, Tisza and Dniester rivers - approximately coinciding with modern-day Romania - became home to a varied group of Thracian peoples, including the Getae and Dacians, sometime around the 7th to 6thcenturies BC. The Getae and Dacians are related but distinct peoples that are sometimes treated as a single group under the name of Geto-Dacians. The Getae and the Dacians shared many cultural and linguistic similarities. Living in the lower Danube basin, the Getae were able to establish regular trade with the Greek cities along the coast of the Black Sea. The Dacians were located in the Carpatho-Danubian basin along the southern border of the Carpathian Mountains. This relative geographic isolation allowed the Dacians to survive catastrophic struggles - often with the Getae - and thrive to become the dominant tribe by the 1stcentury BC.