Chalkis ( Halkis) the main town of the greek island of Evia (Euboea), is situated on the Euripus strait. The town is connected to the mainland Greece by "the sliding bridge" at the narrowest point of Euripus strait.
Euripus ( or Evripous) strait , about 8 km long, is famous for its special current tide phenomenon which is not fully understood yet. It has strong currents that change directions every seven (or more) hours a day. Ships are allowed to pass when the tide is slack.
Chalkis capital of Evia (Euboea) island
Connected by a bridge to greek mainland
Carrying trafic across Euripos strait
Where a unique sea tide takes place