Kushimoto in Wakayama prefecture has the distinction of being the southernmost point of Japan’s main island of Honshū. The town is also the location of the Oshima Minato Matsuri, a traditional port festival held in early February every year. I don’t really know that much about the festival, except that it includes many Shinto rituals, lion dances (shishimai), and an ocean boat race using oar-powered boats called kaidenma.
The following photos, I took from the Kushimoto town website’s Minato Matsuri page, which you can visit here: https://www.town.kushimoto.wakayama.jp/kanko/event/minatomaturi.html