Northeastern Region (Norðurland eystra)

The Northeastern Region of Iceland — Norðurland eystra — wraps the long Eyjafjörður and Skjálfandi fjord systems on the country's north coast, with Akureyri at the head of Eyjafjörður and Húsavík on Skjálfandi to the east. The tide here is the modulated North Atlantic signal that the long fjord geometry reshapes as it propagates inland from the open Greenland Sea. Mean range at the Akureyri harbour gauge is about 1.4 metres, climbing past 1.9 metres on the largest spring tides and dropping near 0.9 on neaps. The pattern is cleanly semidiurnal, two highs and two lows of comparable size about twelve and a half hours apart. Eyjafjörður is the longest fjord in Iceland — about 60 kilometres from the Greenland Sea opening south past Hrísey island to the Akureyri industrial harbour at the head — and the propagating tide reaches the head of the fjord about an hour after the open-coast timing while gaining slightly in amplitude through the funnel geometry. The defining latitude feature is the Arctic Circle, which sits about 60 kilometres north of the Akureyri harbour through Grímsey island; the photoperiod extreme produces about 24 hours of midday twilight in the deepest December weeks and continuous daylight for most of June. Solunar fishing windows extend through the entire white night in summer and compress to a four-hour midday window in winter — a different planning calendar than any temperate-zone coast runs. The whale-watching fleet at Húsavík reads tide and current for humpback feeding grounds at Skjálfandi; the working herring boats out of Dalvík, the geothermal sea swim at Bjórböðin, and the puffin colony at Lundey island all read the table for different windows. Sjómælingar Íslands publishes the authoritative tide tables; Open-Meteo Marine drives the gridded predictions on this site.