How Things Really Work on Instagram: "After the devastating 2011 Tōhoku earthquake and tsunami, Japan began one of the largest coastal protection efforts in modern history. The result was a 246-mile (nearly 400 km) network of tsunami seawalls constructed along vulnerable sections of the country’s Pacific coastline, combined with the planting of millions of trees to create natural buffer zones. These seawalls vary in height depending on local risk, with some sections reaching 40 feet (12 meters)