Welcome to today's article. You have probably seen photos of water so green it looks edited, and assumed someone pushed the saturation slider too far.

The Petrohué River in southern Chile really is that color, and the reason is simple: it drains Lake Todos los Santos, which is fed by glacial melt and volcanic sediment that scatters light in a way that leaves the water turquoise. The river sits inside Vicente Pérez Rosales National Park, Chile's oldest, established in 1926, and it's about 50 kilometers from Puerto Varas along a paved road that climbs past Llanquihue Lake with the Osorno volcano sitting right there in front of you.

Start at the falls, not the river

Most people treat the Petrohué as a photo stop, but the real anchor is Saltos del Petrohué, a short series of rapids where the river squeezes through dark basalt channels left by old lava flows. There's a network of wooden walkways and viewing platforms, and you can walk the whole loop in under an hour. Go early. By mid-morning the tour buses from Puerto Varas arrive and the platforms get crowded, which kills any chance of a clean shot. The entrance fee is around 10 USD for foreign visitors, and you pay at the gate.

Getting there and getting around

You have two realistic options. Drive yourself, roughly 45 minutes from Puerto Varas, or take a local bus from the Puerto Varas terminal that runs toward Ensenada and the park entrance. The road is good, but fuel up before you leave town because stations get sparse past Ensenada. Once inside the park, distances are short and you'll do most of it on foot.

Crossing the lake by boat

At the end of the road sits Petrohué village, a small settlement on the lake shore where the ferry to Peulla departs. This is the classic Andean lake crossing route into Argentina, and the boat ride across Todos los Santos takes about two hours. Even if you're not continuing to Argentina, the crossing is worth doing for the views of the Puntiagudo and Tronador peaks. Book ahead in summer, since seats sell out and the schedule is limited to a few departures a day.

What to budget and when to go

Plan on around 10 USD for the falls entrance, 15 to 25 USD for a round-trip bus from Puerto Varas, and a hotel room in the village or in Ensenada starting near 80 USD a night. Summer, roughly December through February, brings the driest weather and the busiest crowds. Shoulder months like November and March give you cooler air, thinner crowds, and the same green water.

Before you go

Bring a rain layer no matter the forecast, because this part of Chile gets frequent showers and the weather shifts fast. Wear shoes with grip, since the walkways get slick. And keep in mind the water is cold glacial melt, so swimming is for the brave and the brief.

The Petrohué isn't a place you rush through. Give it a full day, catch the falls before the buses, and let the ferry ride be the slow part of your trip. If you plan around the crowds and the weather instead of fighting them, the river gives you exactly what those photos promised.