SLOVENIA. Sava River Valley. 1989. A twilight moon rises above the Kaminske mountains and Slovenia's Sava River Valley. Early in the seventh century, during great migrations of people across Europe, Slavic tribes from the northeast began to colonize this valley and the rugged Balkan Peninsula to the south. Their decendants are the slavic "nations" that make up modern Yugoslavia, including the Slovenes, one of Europes's smallest ethnic groups.