Answer: Brazil
Notes: A Brazilian surfer recently used the pororoca tidal wave on the Mearim River to spread awareness about climate change and ecological damage. The Mearim River is around 800 kilometres long and flows through Maranhão state in northern Brazil. The Mearim River is known for its pororoca, a strong tidal bore where ocean tides rush upstream into the river. The word "pororoca" comes from the Tupi Indigenous language and means "great roar", due to the loud sound made when sea and river waters collide. A tidal bore forms when rising ocean tides push against the river’s flow, often during spring tides and supermoons.
