Category
page 1Tidal bores
Fly River
river in Papua New Guinea and Indonesia
tidal bore
water wave traveling upstream a river or narrow bay due to incoming tide
River Dee
river in Aberdeenshire, Scotland, UK, flows into the North Sea at Aberdeen
Qiantang River
river in western Zhejiang, China
Mearim River
river in Maranhão, Brazil

Pororoca
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.

Simanggang
Petitcodiac River
river in New Brunswick, Canada
Severn bore
tidal bore seen on the tidal reaches of the River Severn in south western England