Bulgaria

Early-warning radar

Connects Bulgaria to: St. Lewis, Newfoundland and Labrador

Battle of Pliska

Connects Bulgaria to: Varbitsa (town)

Multi-party system

Connects Bulgaria to: Puntland

Asen dynasty

Connects Bulgaria to: Veliko Tarnovo, Bulgaria | Strumica, North Macedonia

Ivan Asen II of Bulgaria

Connects Bulgaria to: Plovdiv, Bulgaria | Arbanasi (Veliko Tarnovo), Bulgaria

Uprising of Asen and Peter

Connects Bulgaria to: Veliko Tarnovo, Bulgaria | Constanța, Romania

2007 enlargement of the European Union

Connects Bulgaria to: Region of Murcia | Ruse, Bulgaria

Asparuh of Bulgaria

Connects Bulgaria to: Varna, Bulgaria | Glozhene, Bulgaria

Sofia University

Connects Bulgaria to: Sofia, Bulgaria | Saints Constantine and Helena, Bulgaria

Karanovo culture

Connects Bulgaria to: Dolna Kula, Bulgaria | Gorna Kula, Bulgaria

Russo-Turkish War of 1877–78

Connects Bulgaria to: Oryahovo | Peshtera | Sredets, Burgas Province

Enlargement of NATO

Connects Bulgaria to: Hungary | Bosnia and Herzegovina | Georgia (country)