Sognefjord stretches 205 kilometres inland from the North Sea, plunging 1,308 metres below sea level at its deepest sounding — the longest and deepest fjord in Norway, carved by ice sheets that retreated 10,000 years ago. The express boats that ply its length today retrace merchant routes established in the Viking Age, when longships carried timber, furs, and dried cod from the inner valleys to Bergen's quays. Cruise operators departing Strandkaiterminalen follow the same bearing, threading the narrow mouth at Solund before the cliffs open onto the main channel. The fjord's tributary arms — Nærøyfjord, Aurlandsfjord, Lusterfjord — hold UNESCO World Heritage status for their unaltered glacial morphology. Vertical walls rise 1,400 metres from waterlines so narrow that ferry captains navigate by echo sounder and local knowledge. Waterfalls fed by the Jostedalsbreen ice cap cascade year-round, their meltwater etching fresh channels in the basalt. Villages cling to alluvial fans at the base of U-shaped valleys, accessible only by boat or the serpentine roads blasted through the rock after 1950. Flåm, at the head of Aurlandsfjord, serves as the terminus for the Bergen-Oslo rail line's mountain spur — a 20-kilometre descent through 20 tunnels, completed in 1940 and still considered one of the steepest standard-gauge railways in Europe. Sognefjord day cruise from bergen tours typically combine express catamarans with the Flåm Railway, allowing passengers to traverse the fjord by water and return via the plateau. The Stegastein viewpoint, cantilevered 650 metres above Aurlandsfjord, provides a cartographic perspective on the drainage basin. Cruise schedules align with the railway timetable, departing Bergen at 08:00 and returning by evening. Winter sailings continue year-round; the gulf stream moderates temperatures, keeping the fjord ice-free even in January. Spring melt swells the waterfalls to maximum volume, while autumn reduces tourist traffic and sharpens the light on the valley walls. The route passes Vik's 12th-century stave church, Balestrand's English villas, and the branching inlets that divide the Sogn region into parishes accessible only by boat until the mid-20th century.