Sento vs. Onsen

After Spa World, I've been craving more soaks. Our hotel in Okayama recommended this place, but was clear to identify it as a sento, not onsen. Apparently, while the etiquette and process are similar, onsen involve mineral waters, sento just regular water. This sento was super local, casual, and basic. At about $4.50 entrance fee, it's a spa for everyone. Especially you.