Less well-known than the Chinese river wave that the Red Bull crew loves surfing, and maybe less well known than this wave in India, the Pororoca, Amazon’s mighty tidal bore wave, is nevertheless among the world’s most impressive natural phenomena. Or at least, it was until 2013.

Seems the wave has disappeared.

Why? Buffaloes, apparently. Maybe dams, too.

Take it from the NY Times:

“Some blame the buffaloes: For years, ranchers have opened canals from the river to slake their herds' thirst, while the buffaloes themselves trampled around the banks of the Araguari, depleting the river's flow, according to environmental activists. The ranchers say two dams diminished the Araguari's strength.

Whatever the exact cause, Brazilian surfers haven’t seen the wave break with any sort of quality for three years now. A real shame, for those who loved endless and endlessly dangerous tidal bore waves, filled with logs, snakes, crocs (probably both real crocodiles and the rubber shoes).

"The Pororoca in Amapá was the best in the world," said Serginho Laus, 36, a professional surfer who has pioneered trips to Amapá and set a record in 2003 for surfing nonstop for 6.3 miles. "Now it's a warning of how man's actions can change our rivers forever."

Read the full story here.