Bülk is a sheltered bay kitesurfing spot in Kiel Fjord, Germany, characterized by flat to very small wave conditions typical of Baltic Sea internal waters. The bay faces northeast with a narrow entrance, providing natural wind acceleration and protection from larger ocean swells. The spot appears adjacent to industrial wastewater treatment facilities, which may affect water quality and introduce discharge currents. The predominantly flat water makes this suitable for learners and those practicing tricks rather than wave riding. Best conditions occur with northwesterly to westerly winds (270-315°), which approach side-shore. Wind reliability is relatively low at 24.8%, making sessions dependent on seasonal patterns. The shallow protected waters and small fetch distance keep wave energy minimal. Kiters should be aware of industrial operations, potential currents from facility discharge, and limited natural beach access. This spot suits beginners and intermediate riders seeking flat-water conditions but requires vigilance regarding water quality and industrial proximity.