The hook
The stretch of Route 1 where Iceland unloads everything at once: waterfalls you can walk behind, a beach of black sand and basalt columns under sea stacks, glacier tongues spilling off an icecap, and a lagoon of drifting icebergs, all within a few hours' drive.
01Why it's worth it
The south coast is the densest run of scenery in the country and the reason the Ring Road has become one of the world's great drives. Seljalandsfoss falls in a curtain you can walk behind; Skógafoss drops 60 metres in a wall of spray with a stair beside it to a trail into the highlands; Reynisfjara's black sand, hexagonal basalt and offshore stacks are extraordinary and genuinely dangerous, sneaker waves there have killed visitors, and the warning signs are not decorative. Further east, Vatnajökull sends glacier tongues down to the road, ice caves open under it in winter, and Jökulsárlón's lagoon carries icebergs to a beach where they strand like glass. The whole coast is treeless, volcanic, and weather-driven: hail, sun and rain inside an hour is normal, and roads close without much notice. Camping is the cheap way to do it in a country that is otherwise expensive.
02How to experience it
Drive it over several days rather than day-tripping from Reykjavík — the distances are long and the best light is early and late. Book a 4x4 only if you plan on the F-roads. Check road.is and vedur.is every morning; conditions decide the itinerary, not the plan. Stand well back at Reynisfjara. In winter add an ice cave and aurora; in summer, take the midnight light.
From the locals
Visitors describe it as somewhere that resists photography: "it's a really nice place, it really is another world, pics don't do it justice," wrote one who camped for twenty days, adding the practical note that "Iceland is the best place in the world to camp… I totally recommend it if you want to save some money." The weather advice recurs everywhere: "waterproof shoes are very important. You may have hail and then blue skies 5 minutes later, then more hail, then rain later."