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von Birgid (DE), 2011-07-18, 14:00   Spam?  

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von krautteich (DE), Last modified: 2011-07-18, 14:02   Spam?  

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von Catesse (AU), Last modified: 2011-07-18, 14:47   Spam?  

I think that this does not mean that the waterfront extends over this length in a straight line (sort of), but the amont of space for berthing ships reaches this total. (Think of pictures of aircraft in unloading bays.) My explanation is not clear, but I think that gbu is close with the term "Kailänge".
See the intricacy of the harbour layout here, or on Google.
Wikipedia(EN): Port_of_Los_Angeles
See if you can do anything by searching for a translation of the term "docking space", which is not precisely the term  you want. As my computer is set up. it will translate only into English, not from English.
Second edit: Yes, MichaelK seems to have the answer.

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von MichaelK (US), Last modified: 2011-07-18, 14:37   Spam?  

Die Uferlänge eines Hafens soll auf die Umschlagkapazität hindeuten. Hier wird aber oft gemogelt, besonders in den USA.
Google: uferlänge hafen

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von uffie (GH/KI), 2011-07-18, 17:15   Spam?  

Hafengebiet could include the area behind the docks further inland

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von Barloup (DE), 2011-07-19, 06:59   Spam?  

Thanks a lot - that's exactly what I wanted to have confirmed.