Glymur Waterfall Trail
Glymur Waterfall Trail Guide: Hiking Iceland’s Tallest Cascade
Experience the raw beauty of Iceland on the Glymur Waterfall Trail, a captivating route that leads adventurers through lush mossy forests, dramatic gorges, and steep river canyons to the base of Glymur—one of the country’s tallest and most awe-inspiring waterfalls. As you journey along the path, panoramic views open up, showcasing sweeping valleys and the glimmer of Hvalfjörður fjord beyond.
Cross clear mountain streams and navigate rocky slopes, where every step brings you closer to the thunderous cascade of water plunging over a 198-meter cliff. With its blend of untamed wilderness and unforgettable vistas, the Glymur Waterfall Trail delivers a quintessential Icelandic hiking experience, perfect for those seeking both adventure and natural wonder.
Route Overview
The Glymur Waterfall Trail begins at a clearly marked parking lot in the Botnsdalur Valley, located at the end of Hvalfjörður fjord, approximately one hour’s drive northeast of Reykjavik. From the trailhead, the route initially passes through a short tunnel-like cave (Þvottahellir), then proceeds along a relatively flat riverside path before reaching the first major crossing. Here, hikers traverse the Botnsá river using a narrow log or cable bridge—this is considered one of the hike’s most memorable features.
After crossing, the trail steepens and winds through a series of rocky and sometimes muddy switchbacks alongside the canyon. Expect to pass through mossy forests and open viewpoints as the climb continues. The path eventually splits near the waterfall: one route climbs to the canyon rim for a sweeping view above Glymur, while the other offers closer vantage points lower down. Some hikers choose to return the same way, while others complete a loop by crossing the river higher up (conditions permitting) and descending along the opposite side.
The total distance is about 7 kilometers round-trip, with a duration of 3 to 4 hours for most hikers, depending on conditions and time spent at viewpoints. Trail surfaces include dirt, rocky segments, and occasional wet or slippery areas. Waymarking is present but limited, so attention to the path is necessary, especially in fog or adverse weather. The trail is most safely and comfortably completed in late spring through early autumn.
Historical Background of Glymur Waterfall Trail
The Glymur Waterfall Trail is steeped in local lore and natural history, intertwining its rugged landscapes with centuries-old Icelandic legends. Glymur itself held the title of Iceland’s tallest known waterfall until the discovery of Morsárfoss in 2007, but it remains revered for its dramatic beauty and mystical significance. According to folklore, the waterfall’s name—Glymur, meaning “clash” or “rumble”—is derived from the powerful sounds created as water plunges into the canyon below. One popular legend tells of a giant whale who, after being lured up the Hvalfjörður fjord, became trapped and transformed into stone, forming the base of the canyon from which Glymur rushes forth.
The surrounding area, Hvalfjörður (Whale Fjord), also bears a rich history, having served as a strategic naval base for Allied forces during World War II. While the trail itself was once accessible only by wading or fording the river’s cold waters, a modern footbridge and trail improvements have made it more accessible, inviting outdoor enthusiasts from around the world to explore this stunning natural landmark. As you trek the path, you’re not only witnessing geological wonder—but also walking amidst the echoes of Icelandic storytelling and historical events.
Notable highlights
- Glymur Waterfall: The main attraction, this striking 198-meter waterfall tumbles into a deep, moss-carpeted canyon, delivering dramatic views and powerful soundscapes from multiple vantage points along the trail.
- River Crossing: Early in the hike, you’ll encounter a narrow, sturdy log or cable bridge spanning a rushing river. This thrilling crossing is an iconic part of the Glymur adventure.
- Lava Cave (Þvottahellir): A natural cave near the trailhead, said in folklore to have once served as a washing site. It’s a fascinating geological formation and a great spot for sheltered photos.
- Mossy Canyon Views: The trail hugs the edge of a stunning gorge blanketed with lush Icelandic moss and wildflowers, offering breathtaking photo opportunities and panoramic perspectives.
- Hvalfjörður Fjord Vistas: As you ascend, look back for sweeping views of Hvalfjörður, one of Iceland’s most beautiful and least-visited fjords.
- Birdlife and Flora: The area is rich in native bird species and boasts vibrant greenery, especially during the spring and summer months.
- Rock Formations: Unique basalt columns and volcanic rock formations line the path, testifying to the region’s dynamic geological history.
Challenges to expect
Hikers on the Glymur Waterfall Trail should prepare for some challenging terrain, including steep, rocky paths and uneven ground. Several sections of the trail require careful footing, particularly along the canyon edge and during the ascent to higher viewpoints. The log or cable bridge river crossing can be slippery and intimidating, especially after rainfall or during periods of high water. For those with a fear of heights or limited mobility, these portions may prove difficult.
Icelandic weather is notoriously unpredictable, with sudden rain showers, wind gusts, and rapid drops in temperature—even in summer. This can make the trail muddy and more treacherous, so sturdy waterproof footwear and layered clothing are highly recommended. The route is only partially marked, so poor visibility in fog or mist can complicate navigation. Always check weather conditions before setting out and consider turning back if conditions deteriorate.
Iceland - Mountainous
- Forest
- Dirt
- Rocky
- Wild camping spots
- Accommodation Not Required
- Family Friendly
- Pet Friendly
- Restrooms
The hike begins at the Botnsdalur Valley parking lot, with the initial stretch following a well-trodden dirt path through lush surroundings. Quickly, you'll encounter the Þvottahellir cave near the trailhead, then continue along the Botnsá river. The first major challenge is crossing the river via a narrow log or cable bridge. After crossing, the trail becomes steeper and more rocky, climbing alongside the dramatic canyon as the sound of Glymur Waterfall grows louder. Along the ascent, you will pass through mossy forest areas and have access to several viewpoints offering spectacular glimpses of both the canyon below and Hvalfjörður fjord in the distance. The main viewpoint overlooking Glymur Waterfall marks the turnaround point. Here, hikers can take in the full scale of Iceland’s second-tallest waterfall before retracing their steps along the same path or, conditions permitting, completing a circuit by crossing upstream and following the trail down the canyon’s opposite side back to the trailhead.