What is a 'bluff'?

The term 'bluff' has several meanings depending on the context. In this case, the best understanding is that it refers to a high steep bank, which is commonly seen in geographical contexts as a steep cliff or bank of earth. Such formations can be found alongside rivers or coastal areas.

The interpretation of 'bluff' as a high steep bank makes the most sense when considering physical geography, as these landforms can significantly affect the surrounding landscape and ecosystems. This definition aligns well with what one might see in nature, particularly in contexts where rivers or bodies of water create steep terrain.

While 'bluff' can also imply deception or trickery in social contexts, that meaning is not relevant here. The other definitions such as a calm flat area or a lowland region do not apply, as they describe completely different types of landscapes that do not relate to the word 'bluff.'