Trondheim is a critical battleground for both factions. Trondheim was the name of a planet in the Hundred Worlds of the Ender's Game book series. Trondheim has an international airport, Trondheim Airport, Værnes, situated in Stjørdal, which is Norway's fourth largest airport in terms of passenger traffic. Værnes has non-stop connections to cities such as London, Amsterdam, Copenhagen, Stockholm and Berlin, among others. The domestic route Trondheim - Oslo is among the busiest air routes in Europe with around 2 million passengers annually. Busiest air routes Major railway connections are the northbound Nordland Line, the eastbound Meråker Line to Åre and
Port of Varna east-northeast of Varna. Two inland canals connect the sea and Port of Varna East with Lake Varna, Lake Beloslav and Port of Varna West: Channel 1 with draft 11.5 m and Channel 2 with draft 11.0 m. The canals form an island (Острова) on which a deepwater oil terminal, among other port facilities, is currently located. The depths of the ship berths and the approaches allow the handling of vessels of capacity up to 50,000 gross tonnes. In view of the stated safe canal depths, only vessels of draft less than and airdraft up to are allowed to Varna West.