The research area is located in the northern part of Lubuk Bendahara Village, Rokan IV Koto District, Rokan Hulu Regency, Riau Province., has coordinates 0° 36' 47.541888"– 0° 39' 28.953396"North latitude and 100° 27' 22.89924" – 100° 35' 17.62044". with an area of 25 km2 research area. This study aims to determine the type of rock, river flow patterns, van Zuidam geomorphological forms…