Momiji actually refers to the maple leaves when they turn colour in autumn. There's a saying in Japanese that the momiji is like a tiny baby's hand. That's probably because the Japanese maple has much smaller leaves than its counterparts in other countries, making it look really delicate and cute. Nikko is colder than Tokyo so when we went we were lucky to catch the leaves in their fall colours already. We didn't have time to venture down to the Lake Chuzenji area as it was a day trip but the trees near the temples were pretty enough.