This interactive collapsible tree visualizes a hierarchical dataset representing Colombian municipalities grouped under categories like "analytics," "animate," and "data." Built with D3 v3 and rendered as SVG with animated transitions, the layout follows the Reingold–Tilford algorithm to position nodes. Clicking any node toggles its children, collapsing or expanding the subtree with smooth animations. Nodes are white circles with steelblue borders, connected by gray curved links, and labeled with 10px sans-serif text. The root node is "Santander," and each leaf displays a size value, likely representing a metric like population or data volume. The visualization supports interactive exploration of hierarchical structures and is licensed under GPL-3.0.