Serbia's smallest river — the Vrelo. This is known as the "One-year-long River", due to its length— 365 m— from its source to its end, with the length in metres corresponding to the number of days in a year. The Vrelo flows into the Drina just a few hundred metres below the artificial lake. Wikipedia
Hmm... when i saw the title i first thought it was Vrelo Bosne, as they have similar little bridges there... Really nice shot. And i know a river which only has 55m.