River surfing

water wave traveling upstream a river or narrow bay due to incoming tide

municipality of Pará state, Brazil

river in Riau, Indonesia

thumb|Pororoca near the mouth of the Araguari River (Amapá)|Araguari River, seen from an airplane The Pororoca (, ) is a tidal bore, with waves up to high that travel as much as inland upstream on the Amazon River and adjacent rivers. It occurs at the mouth of the river where its waters meet the Atlantic Ocean. It can be observed from the islands Marajó and Caviana, and in various rivers of the state Pará.

manmade river in Munich

river in New Brunswick, Canada

waterfall in Norway

sport of surfing either standing waves, tidal bores or upstream waves in rivers

railway station in Voss, Norway

standing wave in the Lachine Rapids

tidal bore seen on the tidal reaches of the River Severn in south western England