Acronyms that contain the term birka 

Birka

Birka listen (Birca in medieval sources), on the island of Björkö (literally: "Birch Island") in present-day Sweden, was an important Viking Age trading center which handled goods from Scandinavia and Finland as well as Central and Eastern Europe and the Orient. Björkö is located in Lake Mälaren, 30 kilometers west of contemporary Stockholm, in the municipality of Ekerö. Birka was founded around AD 750 and it flourished for more than 200  years. It was abandoned c. AD 975, around the same time Sigtuna was founded as a Christian town some 35 km to the northeast. It has been estimated that the population in Viking Age Birka was between 500 and 1000 people.The archaeological sites of Birka and Hovgården, on the neighbouring island of Adelsö, make up an archaeological complex which illustrates the elaborate trading networks of Viking Scandinavia and their influence on the subsequent history of Europe. Generally regarded as Sweden's oldest town, Birka (along with Hovgården) has been a UNESCO World Heritage Site since 1993. A silver ring from a Viking-era grave in Birka is the first ring with Arabic inscription from that era found in Scandinavia.

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