Welcome to Lago de Coatepeque
Approaching Lago de Coatapeque via road, visitors are struck by the dramatic beauty of the 6km-wide sparkling blue caldera. You'll notice many cars slowing down at the mirador when the lake first comes into view. It's also remarkably free of crowds – mostly as the majority of properties dotting the lake's edge are privately owned by San Salvador's elite – and you can swim, dive or splash about in a boat without fear of the dreaded blue-green algae, an algal bloom that can cause skin irritations and sickness if ingested.
For around US$5, day-trippers can enjoy lake access at one of the hotels on the northeast shore. For US$20 you can rent a boat for a couple of hours.