human
Produce a detailed description of a rocky island in a river with a muddy shoreline and a sandy bank.
assistant
Towering over the river's surface, the looming bulk of the rocky island creates a sheltered area in the churning currents of the river. Silt has been deposited in the refuge, forming a small muddy shoreline. Mud gives way to drier sand of a bank that hugs the edge of the rock.