Which feature is associated with the deposition of sediments in river systems?

Point bars are indeed features associated with the deposition of sediments in river systems. They typically form on the inside bends of meandering rivers. As water flows around a bend, the velocity decreases on the inside curve compared to the outer curve. This reduced velocity allows sediment carried by the water, such as sand and gravel, to settle and accumulate, creating a point bar. Over time, these accumulations of sediment can expand and reshape the river's channel, influencing the river's morphology.

In contrast, incised meanders occur when a river cuts deeply into its own floodplain, often due to a drop in base level or changes in flows over time, leading to erosion rather than deposition. Canyons are characterized by steep, often vertical sides formed primarily through erosion by fast-flowing rivers, indicating more of a removal of materials. Floodplains are areas adjacent to a river that can also experience sediment deposition during flood events, but they do not characterize the same localized deposition as point bars typically found in meander bends. Thus, point bars are specifically associated with sediment deposition in the context of flowing river systems.