The Nenggiri River is one of the major tributaries of the Kelantan River together with the Lebir and Pergau, was part of an old trade route. It has its source in the Lojing Highlands in southwest Kelantan. From the highlands it meanders its way through a series of rapids and later joins the Kelantan River at Kuala Krai.

A section of the river, from Kuala Betis to Kuala Setelu, has become the playground of adventure and nature lovers. This remote area will probably remain unchanged for some years to come. Vast tracks of virgin jungle line both sides of the river broken occasionally by an orang asli settlement and limestone outcrops.

Rafting down the river either on bamboo raft or rubber inner tubes is the best form of traversing this section of the river. Just float down, or paddle if you want to go faster. A trip of 3 days and 2 nights will be adequate to cover this section. Just savour the atmosphere while being accompanied by cacophony of sounds from animals and birds in a jungle environment. If you are lucky, you may be able to sight them because they are mostly nocturnal creatures.Gua Cha (Cha Cave), 16km downstream of Kuala Betis, has prehistoric remains, and is one of the most important archeological sites in Peninsular Malaysia.