The Kampar River widens as it approaches the sea, and its water volume increases as it is joined by various other tributaries.During the rainy season, normally November to December, the volume of river water is greatly increased, and the river's shallow estuary becomes even wider. Upstream the river's cross section changes suddenly, becoming much narrower, which encourages the generation of large waves called Bono, caused by high tides flowing upstream meeting the river water flowing downstream. The waves can travel from the sea at speeds of up to 40 kilometres per hour (25 mph), and when sea water at full tide combines with heavy rain upstream they can reach a height of 4–6 metres (13–20 ft), accompanied by a loud roaring sound and strong winds.
Bono waves can persist for four hours or more, and travel as far upstream as Tanjung Pungai, Meranti, Pelalawan Regency, 60 kilometres (37 mi) inland. Bono is not just one wave but a series of many, sometimes on the left and right river banks and at other times in the middle of the river. Surfing the Bono waves is difficult, owing to the quantity of mud in the river.
The large number of ships sunk in the Kampar River's estuary has been attributed to the Bono waves, called by locals as "Seven Ghosts", considered to be the incarnation of the seven evil spirits. Although they still used the river as the ground for boating agility tests.
The river is inhabited by crocodiles, hence the surfers are usually escorted by rescue boats for their safety.
LOCATION
Bono wave can be seen in many location of Kampar river, such as: Tanjung Sebayang, Pulau Muda, Teluk Meranti and Tanjung Pungai, all of them in Pelalawan Regency. The location can be reached from Pangkalan Kerinci within 4 hours by car, or 3 hours by speedboat. Pangkalan Kerinci can be reached within 90 minutes by car from Pekanbaru orPekanbaru international airport. The river can also be reached via nearby Singapore. Bono location is not far from Tesso Nilo National Park and Kerumutan Natural Reserve and local government also planned to extend Bono tourist attraction with ecotourism.http://en.wikipedia.org
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