Senja, Norway: Your Complete Hiking and Northern Lights Guide to the Arctic Island in 2026 Senja is Norway’s second-largest island — a 1,590-square-kilometre Arctic island of vertical sea cliffs, narrow fjords, red fishing villages, and the Segla mountain spire above the Mefjorden that constitutes the finest mountain-meets-ocean view in Northern Norway. The hiking rivals Lofoten. The Northern Lights are as reliable. The crowds are not yet comparable. Your complete 2026 guide to Senja’s best hikes, aurora season, and the National Tourist Route. Senja is the island that everyone who has been to Lofoten says you should go to instead — not because it is better, but because it is what…