Despite being deemed a "perfect" arc, the shape of the Himalaya highlands is interrupted by an embayment that stretches across nearly 2° of longitude in western Nepal. This deviation from a perfect shape, plus a few diverging landforms and fault anomalies, casts a shadow on the geologic processes at play in the region. This anomaly also provides an opportunity to investigate how the Himalayan megathrust fault affects the active growth of the mountain range. Additionally, understanding the nature of the megathrust in the western Himalayas is crucial to evaluating seismic hazards in the region.