I sat for half an hour in the baking heat (35 degrees C today) trying to get photos of these dragonflies (oo-yama-tombo) as they zoomed past me! I took around 100 photos and the ones below were the best.
Link to information on this species: here
Odonata: Corduliidae
Epophthalmia elegans
= oo-yama-tombo
Location: Pond near Yamada Village in Munakata (google map)