From Wiki Grepolis EN
The Harbor is where you expand your fleet. You can build transportation as well as battle units here. The speed with which your shipyard workers complete the ships depends on the level of the Harbor.
- Senate Level 14
- Timber Camp Level 15
- Silver Mine Level 10
The maximum level of the Harbor is 30. (Some older worlds may have a lesser maximum level.) The Harbor's appearance changes depending on its level.
|Level 1 - 7||Level 8 - 15||Level 16 - 30|
|Harbor with Colony Ship|
Resource requirements and construction times noted above are based on World Speed 1 with a Senate of 15 without architecture. For faster worlds, divide the construction time by the world speed.