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Reference.org
Sliven Valley
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<p>Sliven Valley is situated in eastern central <a href="/facts/Bulgaria/Er5pY3YS">Bulgaria</a>. It is named after the city of <a href="/facts/Sliven/hdErGUXe">Sliven</a>, its main settlement. It is the ninth of the eleven <a href="/facts/Sub-Balkan_valley/Er5pY3YS">Sub-Balkan valleys</a> in direction west–east and is the second largest of them, after the <a href="/facts/Sofia_Valley/ml2P13qd">Sofia Valley</a>. </p>