Tulcea is the gateway to the Danube Delta, Europe's largest wetland and a UNESCO Biosphere Reserve. The city itself is functional rather than beautiful — a mid-sized Romanian port on the right bank of the Danube — but almost everyone who visits the delta passes through here.
Boats to the delta's channels and villages leave from Tulcea's river station. You can arrange day trips or multi-day excursions to see pelican colonies, floating reed islands, and fishing villages like Sulina and Sfântu Gheorghe. The Danube Delta Museum in town gives useful context on the ecosystem before you head out.
Tulcea is about five hours by car or train from Bucharest. The best time to visit is May through September, when the birdlife is at its peak and the weather makes boat trips pleasant.