Wanderlust World Wanderlust World The River Spree flows 382 km (237 mi) from the Lusatian Highlands (Saxony) through Brandenburg and Berlin, joining the Havel at Spandau. It's navigable most of its length. Berlin was founded on a Spree island; landmarks like the Reichstag, Brandenburg Gate, and Berlin Cathedral line its banks. Today it's a recreation hub with parks, promenades, boating, and cycling paths.