The river mouth is located between Sebuyau and Kampung Teriso, in Sri Aman Division.

[1][2] Notable settlements along the Lupar River, arranged from the mouth to upriver are: The tidal bore, known locally as benak is a unique natural phenomenon in which the incoming tide form waves as high as three meters that travel up the river against the current.

Besides water-based events, the festival also features Miss Tourism Benak and Ratu Kebaya Benak, singing competitions and food bazaars, traditional games, a trade expo with sale of local produce, an exhibition on the tidal bore in Batang Lupar and a showcase of traditional Iban, Malay and Chinese wedding ceremonies.

[1] These crocodile attacks became the source of local legend and mythology, named Bujang Senang (happy bachelor) which refers to a 19 ft-crocodile that inhabited the Lupar River.

[1][7][8] In popular culture, the name Bujang Senang (the Crocs) was adopted as the nickname of the state’s football team Sarawak FA.