boiling hot spring water
healing
hking
hongucho
hot spring
hot spring egg
japan
kii mountains
kumano kodo
mineral rich
mountain
oldest onsen town
onsen tamago
pilgrimage route
remote village
river
riverbank
shimoyukawa
tanabeshi
trekking
unesco world heritage hot springs
wakayama
wakayamaken
yunomine onsen
yuzutsu