Which term describes spots where observers can enter and where paths converge?

The term that best describes spots where observers can enter and where paths converge is "nodes." In the context of urban design and architecture, nodes serve as key focal points in the environment, allowing for movement and interaction among various paths or routes. They are often characterized by their significance to people as places of entry, activity, or transition.

Nodes can be plazas, intersections, or transit stations—spaces where individuals gather, access services, or transfer between different modes of transportation. Their importance lies in their ability to facilitate social interaction and connectivity within the urban fabric, promoting a vibrant and dynamic experience for users.

The other terms listed have distinct meanings within urban studies. Districts refer to areas with a unique identifying character, edges are boundaries or linear elements that define spatial relationships, and landmarks are notable physical features that help with orientation but do not necessarily imply convergence of paths. Nodes specifically align with the idea of convergence and access, making them the most appropriate choice for the described concept.