Best for
Þórsmörk access
The river crossing is the gateway to one of Iceland's most beautiful valleys.
Krossa (Krossá) River Iceland: Þórsmörk Glacial River Crossing Guide
A powerful glacial river originating from Mýrdalsjökull glacier—the notorious ford crossing that guards access to the spectacular Þórsmörk valley.
Updated February 1, 2026By the Iceland.org Travel Team
Region
South Iceland
Dangerous crossings. Use highland buses or super jeeps.
Krossá is one of Iceland's most formidable glacial rivers, forming the natural barrier to the beloved Þórsmörk valley. Fed by meltwater from Mýrdalsjökull glacier, its flow can change dramatically within hours as temperatures rise. The river must be forded by vehicle to reach Þórsmörk—a crossing that has earned a reputation as one of Iceland's most challenging and dangerous river fords, requiring specially modified vehicles.
Safety + sourcing
Last updated: 2026-02-01
Never attempt to ford Krossá in a regular vehicle. Use scheduled highland buses or experienced super jeep operators. River conditions change rapidly—check SafeTravel alerts before traveling.
Sources to check
Source
Mýrdalsjökull
Glacial meltwater with heavy sediment and variable flow.
Warning
Do not ford alone
Only modified super jeeps and highland buses should attempt crossings.
What to Expect at Krossá
- Fast-flowing glacial water with poor visibility of the riverbed
- Multiple braided channels that shift position regularly
- Dramatic mountain backdrop framing the river valley
- Water levels that can surge without warning due to glacial melt
- Spectacular views of Mýrdalsjökull ice cap from the river banks
- Constantly shifting braided channels that change course with every glacial surge
Nearby Attractions
- Þórsmörk nature reserve
- Fimmvörðuháls hiking trail
- Eyjafjallajökull glacier viewpoints
- Seljalandsfoss waterfall (walk behind the falls)
- Laugavegur trail connecting to Landmannalaugar
How to Get to Krossá
- Located at the entrance to Þórsmörk, about 2.5 hours from Reykjavik
- Highland buses run from Reykjavik during summer months
- Super jeep tours available from South Iceland towns
- Hiking alternatives: Fimmvörðuháls trail from Skógafoss
- F-road access only—regular vehicles cannot reach the area
Best Time to Visit Krossá
- Summer (June–September): Only time highland buses operate
- Morning crossings often have lower water levels
- River flow peaks in afternoon from glacial melt
- Early summer may still have high snowmelt levels
- The area is inaccessible in winter
Planning help
Krossá River FAQs
Quick answers with safety notes where it matters.