River Sun Koshi is Nepal’s longest rafting trip. The rafting site, three hours drive from Kathmandu is more accessible than the Karnali. The run is 270 Km and requires 9 to 10 days from Dolalghat to end Chatara down to the Indo-Gangetic plains. The first couple of days are relatively easy while surprise sneaks up on you during the last days. The white water stays white until the very end.