Welcome to Ōwakudani, the steaming heart of Hakone, in Kanagawa Prefecture. Its name means Great Boiling Valley, and the name is honest. Here, vents spew sulfurous steam from reddish-brown, rocky ground, and the air carries the smell of volcanic gas. Hakone is a live volcano. That is easy to forget while you admire clear Lake Ashi, wander the fields of Sengokuhara, or soak in one of the area's many hot springs. Ōwakudani is where Hakone reminds you. It is the epicenter of the volcano's activity, and the heat that keeps so many of Hakone's hot springs hot is tied to this ground. Over the next few stops, we will look at how this valley was born, how it earned and then changed its name, and why a small black egg has become its celebrated trademark. We will also look at how you actually get here, because the journey is part of the experience. Take a slow breath, and let's begin.