With the exception of flat islets blocking the entrance to Marano-Grado lagoon, there are no islands in the gulf.
Its eastern coasts, with Trieste and the Slovenian Littoral, have more rugged relief.
Tides in the gulf are among the largest in the Adriatic Sea, but nevertheless do not usually exceed 60 centimetres (24 in).
Its most prominent features are: The entire Slovenian coastline is located on the Gulf of Trieste.
[2] Towns along the coastline include (from east to west) Koper, Izola, and Piran.