The image depicts a detailed view into a stone-arched tunnel opening onto the Čertovka canal, located under the Charles Bridge in Prague, Czechia

The image depicts a detailed view into a stone-arched tunnel opening onto the Čertovka canal, located under the Charles Bridge in Prague, Czechia. The perspective is elevated, looking down. The tunnel's ceiling is a rough, light-colored stone arch, from which a single ornate, illuminated metal lantern hangs centrally. The left wall of the tunnel is constructed of large, stacked stone blocks, bordering the dark canal water. Along the right bank, a wooden boardwalk extends, illuminated by several upward-facing wall sconces. Small, rectangular indentations are visible along the upper curve of the right side of the archway. Three boats are positioned within the tunnel's opening. The boat closest to the viewer is partially cropped, displaying a dark, flat roof. Adjacent to the wooden boardwalk, a polished wooden boat with a cabin and multiple windows holds several seated passengers. Further along the canal, another dark-colored boat with a roofed cabin is moored. On the wooden boardwalk, a service area is arranged, featuring a counter or bar decorated with evergreen foliage. Several wooden barrels function as tables or decorative elements. Three individuals dressed in white naval-style uniforms, complete with sailor collars and white hats, are standing near this service counter. Beyond the tunnel arch, the canal widens, revealing additional boats and buildings. On the distant right bank, a waterside establishment identifiable as "Čertovka Restaurant" (partially visible) features outdoor seating under a glass or transparent roof, with patrons present. On the distant left bank, a multi-story building with "EUROPE" visible on its facade stands.