Given an evolutionary tree with geographic annotations, the user can easily control the display of ancestral information on the entire tree or a subtree, and can view alternative phylogeographic scenarios along a branch according to a chosen uncertainty threshold. AquaPony interactively visualizes the tree and eases the objective interpretation of evolutionary scenarios. AquaPony’s implementation makes it highly responsive to user interaction, which instantaneously update the tree visualizations even for large trees (which can be exported as image files).